PDF malware analysis — malicious · 14232ba3b675a873

MALICIOUS

PDF

12.8 KB

MD5: 2337899a4e010ba95eb78d38dfe7b12e SHA-1: 714c6ff952b1e9636984dae06a8d7d528d359527 SHA-256: 14232ba3b675a8736c826da46a763aab4cc3df9e349940b79926328d9a74a951

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 a 'PDF_METADATA_EVAL_STAGER'. The JavaScript appears to decode a string and then execute it using `eval()`. This suggests the script's purpose is to download and execute a second-stage payload. The ClamAV detection 'Pdf.Exploit.Dropped-94' further confirms its malicious nature.

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` `96aff8e17746f3bffb15143f91bdb51f7e959a8738efd96873f670cf89929431`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3109	331 bytes

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