PDF malware analysis — malicious · 598a26d6b95751cc

MALICIOUS

PDF

12.5 KB

MD5: efed9624a0e1b3b51821b1be7d5d06d8 SHA-1: 0646590610fd60a44512db4a77e4e30999d863c8 SHA-256: 598a26d6b95751cc42e155e394f6b78568a243ccc5e7440f7e5391d0cb49e020

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by ClamAV with the signature Pdf.Exploit.Dropped-94. Static analysis revealed embedded JavaScript within a PDF metadata stream, which is a common technique for stagers. The ML classifier also strongly indicated maliciousness. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, although the specific payload and its destination could not be determined from the provided evidence.

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` `5e94b28c0222a48aebc8c164613b18f7bdb510100bd50fe7f089f1b1ce794b45`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3008	331 bytes

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