PDF malware analysis — malicious · c4e3ffa117ab1511

MALICIOUS

PDF

12.6 KB

MD5: a823108101e6a4481cc23407550253b5 SHA-1: fd8dee4f81b7246b3c6dd5434cee71432ab71286 SHA-256: c4e3ffa117ab1511f0513157299032baa9adc99a5f147c09942c69186f9c40d9

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by ML classifiers and ClamAV, specifically as 'Pdf.Exploit.Dropped-94'. It contains embedded JavaScript within its metadata and a separate JS stream, indicating an attempt to execute code. The heuristics suggest a stager mechanism within the PDF metadata that uses JavaScript eval to decode and execute further code, a common technique for downloading and running secondary payloads.

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` `5c120771b878bc526fdf61b86f04ec77148248411d39350104b527883efd357d`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3035	331 bytes

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