PDF malware analysis — malicious · 08b29a764a18634c

MALICIOUS

PDF

3.2 KB

MD5: eb6dc5536344ccaf583725194c3799d2 SHA-1: 88d6c52d340260e0c9c8483708e8ec79f788deef SHA-256: 08b29a764a18634c18271f8976b397fa06aa994f566227c18baed8980f08af69

206 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that is obfuscated but appears to be designed to exploit a vulnerability. The script attempts to decode and execute content, indicated by the `unescape()` call and the ML classifier's high confidence. The ClamAV detection name 'Pdf.Exploit.Agent-36121' further supports that this is a known exploit targeting PDF documents. The primary function of the script is likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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.
ClamAV: Pdf.Exploit.Agent-36121 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36121
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `289a9f45740cb0ebffe9d034e0b85639bc02a12995e0abc9eb0557219d40b748`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C6	469 bytes

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