PDF malware analysis — malicious · 836498ea8680d447

MALICIOUS

PDF

3.2 KB

MD5: 17b84bb68db0a76eb2ac8593f47fb126 SHA-1: dcbe3b39b03b807ab05050274aa051436e57968a SHA-256: 836498ea8680d447c1b94e316c4996047e3ead63fb4d7f613f5931f83fa1def1

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 is obfuscated but appears to be designed to exploit a vulnerability. The script utilizes the `unescape()` function and is flagged by multiple high-severity heuristics related to PDF JavaScript exploits. The primary function of the script is to decode and execute a string derived from the PDF's title, likely to download and execute a secondary payload. This behavior is consistent with a malicious PDF dropper.

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` `82b3f0dba6e4d174a18951d4b07da01cbe77fe4b7b57c92ae180a13e3a0433db`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C9	442 bytes

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