PDF malware analysis — malicious · 0960cc8d84b761e3

MALICIOUS

PDF

3.2 KB

MD5: 3b881ccba8847700caecff578801b188 SHA-1: 2fdd5ed4649d92e671c36675378f1d5cc18b2f23 SHA-256: 0960cc8d84b761e32c5d0660f6c8123b9f9b5d14c60ca61f10aea785b3335e51

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 leverage the `unescape()` function, a common indicator of exploit attempts. The JavaScript is designed to execute a command, likely to download and run a secondary payload, as suggested by the 'PDF JavaScript exploit cluster' heuristic. The ClamAV detection of 'Pdf.Exploit.Agent-36121' further confirms its malicious nature.

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` `91183beb5347c15f4a8191df389eee8f3a0c268ad5dd5d5cc7114c3e65ba8207`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C7	453 bytes

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