PDF malware analysis — malicious · 85f6e38cb7c9706a

MALICIOUS

PDF

3.2 KB

MD5: 6543525ecb0e8448ef98d6660966871f SHA-1: 28d6d739f1ab431d86cef6e664d1c7d306a272b1 SHA-256: 85f6e38cb7c9706ac9a2ef1841f9b90d82bc9dbdf5ed863bb421500b8cf6420d

206 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that is obfuscated but appears to be designed to exploit a vulnerability. The script attempts to call a function that likely executes a downloaded payload, as indicated by the PDF_JS_EXPLOIT_CLUSTER and PDF_UNESCAPE heuristics. The ClamAV detection name 'Pdf.Exploit.Agent-36121' further supports the malicious nature of the file.

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` `d4cbae2a223365a5882a64a89b7206ce7642509400b5b368793f05804d13e342`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C4	473 bytes

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