PDF malware analysis — malicious · 6166c99cfc48f390

MALICIOUS

PDF

12.4 KB

MD5: 590dd8f6e12a7d721c1c053d062b8e57 SHA-1: e41387198a0ecfe12711795fcff46440dcf3e437 SHA-256: 6166c99cfc48f390a2366093c9cfbdf2de5447e5b8d393cd6f5da71d97387036

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_METADATA_EVAL_STAGER'. This script decodes a string and then uses eval() to execute it, likely to download and run a second-stage payload. The ClamAV detection 'Pdf.Exploit.Dropped-94' further confirms its malicious nature. The presence of JavaScript within a PDF strongly suggests it was delivered as a spearphishing attachment.

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` `8f8e99c641fe904ee81d8c3dc0ec975d1ebe6d7407b647343ea3426034702a7c`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2F7C	331 bytes

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