PDF malware analysis — malicious · 0b6407fcd61703c8

MALICIOUS

PDF

3.2 KB

MD5: 3e3641801f7cd45a40a375042ad9593d SHA-1: 210b0a1bc875d69de69c9138a170fbc3aa3d3d77 SHA-256: 0b6407fcd61703c84d47bb282782b2b6ce07842c696dae6c8bb166010a18c5c5

206 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF file containing embedded JavaScript that utilizes the unescape() function, a common indicator of PDF exploits. The JavaScript appears to be designed to download and execute a second-stage payload, as suggested by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics. The reconstructed JavaScript function call 'a1BV1RZa7j.execScript(nvm8C)' indicates an attempt to run arbitrary 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` `83241e7302f4dff9983fd99f80a4aa227200d8b371edf7695fc86f02ed70d190`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C7	466 bytes

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