PDF malware analysis — malicious · 5d38342a2d8d8a1c

MALICIOUS

PDF

12.8 KB

MD5: 649703cbc416a2703c09cfaca9c43e51 SHA-1: 2dbe687800485021623d5cb72eee0ef999a9a13d SHA-256: 5d38342a2d8d8a1c806e5d002d173719c405f484a309f5dbc83e918ca215680e

146 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 decode and execute a payload. The script uses string concatenation and an eval function, indicating a downloader or stager. The critical ClamAV detection and high-confidence ML classification strongly suggest malicious intent, likely involving exploitation of a PDF vulnerability to achieve initial execution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
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_obj0076_000.js` `dcc4c52bd158a0f89cfd6d7b5d081d3ce356635df5844faf3a4b7029809eda42`	pdf-javascript-stream	PDF /JS object 76 at offset 0x311C	331 bytes

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