PDF malware analysis — malicious · 65a1c4b0c3b5ac7f

MALICIOUS

PDF

12.7 KB

MD5: 2a3dde9e74d0b4bbb2f55e242c76c20e SHA-1: 4f7a19437601c750467bf17100363928f56da1b2 SHA-256: 65a1c4b0c3b5ac7ffa896d9662aeceb94d7cee1fd721afa124c144d40f8137f0

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, identified by multiple heuristics as a stager. The script decodes a string and then uses eval() to execute it, likely to download and run a secondary payload. The ClamAV detection name 'Pdf.Exploit.Dropped-94' further supports this malicious intent. The presence of JavaScript and the stager behavior strongly suggest a malicious document, likely delivered via spearphishing.

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` `bf8529614c98f1bf0dde0ef5f6fd333054c9e64522f286f1e069f6901a2fcdc1`	pdf-javascript-stream	PDF /JS object 76 at offset 0x30AB	331 bytes

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