PDF malware analysis — malicious · 644720bd7566dbe6

MALICIOUS

PDF

12.8 KB

MD5: 750c61947b050498add4118de92ce0a0 SHA-1: 9134d3689829b128f11266926b7ec65fc752267f SHA-256: 644720bd7566dbe62486f2b6a710334d6ed3118942998158173da9175513adb2

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 including 'PDF_JAVASCRIPT' and 'PDF_JS'. The JavaScript code appears to be an eval stager, designed to decode and execute further malicious content. The script reconstructs a string that is then evaluated, likely to download and run a secondary payload. This is further supported by the ClamAV detection name 'Pdf.Exploit.Dropped-94'.

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` `a3a4195e84cae6b02ea47d9a82447c16d5e1b1a889112c1db2d53d1a2e3bf7ee`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3138	331 bytes

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