PDF malware analysis — malicious · fa5adbcef7839689

MALICIOUS

PDF

12.6 KB

MD5: ebc0ebe7e833a19b2992f457b14b12fb SHA-1: f3ad96f9b84f8141c8f022eadbfaa4f42ffa7001 SHA-256: fa5adbcef7839689786a87950e7185f6e8a5ec0b7d7ec561aab85f636b441c12

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, with specific detections indicating it's a dropped exploit. High-confidence heuristics identified embedded JavaScript, including a metadata eval stager, which is a common technique for PDF-based malware delivery. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as indicated by the 'Dropped' classification.

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` `3c944814989280605fb580afdd573b0ebb59497fad2a9414e78963b4c19bceca`	pdf-javascript-stream	PDF /JS object 76 at offset 0x301E	331 bytes

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