PDF malware analysis — malicious · 6bd71e2c3f86abf4

MALICIOUS

PDF

3.2 KB

MD5: d7ee5f480af6e8e0c8da0c20cb3457f6 SHA-1: 22ee4ad4b3287a1776102cb7beef3b2d9c2c1b96 SHA-256: 6bd71e2c3f86abf4edffb9d6001fb82a8938085e4db05b5fa16a6a37c6236b82

206 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a malicious PDF identified by ClamAV as Pdf.Exploit.Agent-36121. Critical heuristics indicate it contains JavaScript designed to exploit a PDF vulnerability, likely to download and execute a second-stage payload. The JavaScript uses the unescape function and calls eval() on a string derived from the PDF's title, which is a common technique for obfuscating malicious code.

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` `c255a98efe7a128f2a3c989ad989b291f49d343b131137efcbe0c7d604fec77e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C9	470 bytes

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