PDF malware analysis — malicious · 139c63007c11903a

MALICIOUS

PDF

3.2 KB

MD5: bb112b22e4c14c62c6fe55b0f51ee45e SHA-1: 0bf8aea97d9ea38255ab861c4ff4a167913c565b SHA-256: 139c63007c11903aa94fed79e15cdd24866ac5cc7efe78e0a7e43c21e98528c9

206 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes an unescape function, a common technique for obfuscating malicious code. The script appears to be designed to execute arbitrary JavaScript, likely to download and run a secondary payload. The ClamAV detection and ML classifier strongly indicate malicious intent, pointing towards an exploit targeting PDF vulnerabilities.

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` `0672848c9146ccaa6562107b1895e76f7d01243eff4771a433ac34cacbcd8a5b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C2	478 bytes

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