PDF malware analysis — malicious · 6f4258bed609ea02

MALICIOUS

PDF

12.4 KB

MD5: b417b6d8e4332270a4084c90e1341a9e SHA-1: 40e58e3040c03eec6c11cffec298e8d8500ccf13 SHA-256: 6f4258bed609ea029cf173b67b90db4b144172e32a7317a56e3545714d02de15

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that is obfuscated but appears to decode and execute a payload. The critical ClamAV detection and high-severity heuristics indicate exploitation of a known PDF vulnerability. The JavaScript attempts to reconstruct a string which is then evaluated, likely to download and run a secondary malicious file.

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` `930a726a00c91df91d888b76659abe9244ff46cd97aa424bc677096cf710cc65`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2F7A	331 bytes

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