PDF malware analysis — malicious · 1335d73407443bbe

MALICIOUS

PDF

12.3 KB

MD5: c3f43ee71f7bc93acca9128e8b30cfa8 SHA-1: d055b8cfe2392d1f6a2ac38e4f4982621f0f5147 SHA-256: 1335d73407443bbecf3563d006a37e6b7222e748d75d9c1412dbf516823428a6

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 as a stager. This script is designed to decode and execute a payload, likely a second-stage downloader, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings. The script reconstructs a string which is then evaluated, suggesting it's responsible for fetching and running the actual malicious content.

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` `4412a91600177a4691afb495372d40b016dda6732b0d04152ef2659f2280f30f`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2EF9	331 bytes

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