PDF malware analysis — malicious · 048bb484b969e432

MALICIOUS

PDF

12.3 KB

MD5: 6b99c84371834f332a87e00300c4127d SHA-1: 41bfec0de1559ac8b731fb31cdff094242e04097 SHA-256: 048bb484b969e432c138c3e319402c4d8e98e4b690699c71f68b12fdf813f1e2

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 be designed to decode and execute a payload. The script uses string concatenation and eval to construct and run code, likely downloading a secondary malicious file. The critical ClamAV detection and high-severity heuristics confirm the malicious nature of the 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` `8a0820d46c8588f23a584e75866952600ea600df4cf9167f88141002a4e69bb9`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2F1C	331 bytes

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