PDF malware analysis — malicious · 40209090ab6cb06f

MALICIOUS

PDF

12.3 KB

MD5: f3cd117f1e30bd5d356db1fd98570854 SHA-1: e07841176fa82fe7ce4220b28965687344c9a12a SHA-256: 40209090ab6cb06f5d60fada5262383f1585fafd67a97d3c863a084d63ea3042

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The critical ClamAV detection and high-severity heuristic firings indicate this PDF contains an exploit. The embedded JavaScript, specifically the 'PDF_METADATA_EVAL_STAGER', suggests it's designed to decode and execute malicious code. This likely leads to the download and execution of a second-stage payload, as indicated by the 'Pdf.Exploit.Dropped-94' ClamAV signature.

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` `849a17b7c9afceda596537b2580ee9efac1e497451064918a3b8df76aba9b975`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2F3C	331 bytes

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