PDF malware analysis — malicious · 183d458ba2ba3b01

MALICIOUS

PDF

3.2 KB

MD5: 8d49afd7c788696f1b51e586ca38c68b SHA-1: c2e72d4a8ef73452c11fdfb6883c1477f2295f0a SHA-256: 183d458ba2ba3b01648a3321ddcb31a193dceb83d71281d181e984b81632f51a

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 decode and execute content, indicated by the `unescape()` call and the ML classifier's high confidence in maliciousness. The ClamAV detection name 'Pdf.Exploit.Agent-36121' further supports that this is a known PDF exploit. The likely intent is to download and execute a second-stage payload.

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` `34cea611bc76ed16cd3dfbdf7efcc22b81b8267eecd4a58f455aa9a544b1e040`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C6	483 bytes

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