PDF malware analysis — malicious · 6b5a8f31a1003a46

MALICIOUS

PDF

3.2 KB

MD5: 69be8173cda977ea42ae94a1f5426395 SHA-1: 1f7a03c0daeaf348b9e6549584f02d6d25539641 SHA-256: 6b5a8f31a1003a4611dd4a61e63eb40c3f9fbf1a0f4fbf1c8b4ba8e8bc423110

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 utilizes the unescape function, a common technique for obfuscating malicious code. The JavaScript appears to be designed to execute a command, likely to download and run a secondary payload. The critical heuristic firings and ClamAV detection strongly indicate this is a malicious exploit document.

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` `2099b43adc0277112e2805e8071647584174ab94b32974630ed3dd72b76b148f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C9	465 bytes

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