PDF malware analysis — malicious · 6e4c5f5b06c40c0f

MALICIOUS

PDF

3.2 KB

MD5: be10ee787972b1352d35b99bce716fd1 SHA-1: 066b3d3ebd5808a3b42132ebabf00acd3367272c SHA-256: 6e4c5f5b06c40c0f7527c9a3ff759525dbb1217d5b412bd4c5fb15bbec5825a5

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 known vulnerability. The presence of PDF_JS_EXPLOIT_CLUSTER and PDF_UNESCAPE heuristics, along with ClamAV detection as Pdf.Exploit.Agent-36121, strongly indicates malicious intent. The JavaScript likely attempts to download and execute a secondary payload, a common technique for malware delivery.

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` `71c5252eb99fe0d6a2b856dd1cdcd2372b58cfec22d42238a04a25f208d7b36e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C6	482 bytes

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