PDF malware analysis — malicious · 181dc572ebe4f134

MALICIOUS

PDF

12.5 KB

MD5: 776ee36e28a1b6bc96634e41749939d3 SHA-1: c70cbcaeced8f4d754dc085cb7dd274da34e8d4f SHA-256: 181dc572ebe4f1344bc9416db0567e9d2c6c9a9c41949ce1b717668b9dc4cbfd

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 code appears to deobfuscate and evaluate a string, likely to download and execute a secondary payload. The ClamAV detection 'Pdf.Exploit.Dropped-94' further confirms its malicious nature. The primary attack vector is likely 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` `6e2fc26b036624c54aaf61783d2a2038ba53bae565272899399e417861cce64f`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2FC0	331 bytes

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