PDF malware analysis — malicious · b3fa3cec25570c24

MALICIOUS

PDF

48.7 KB

MD5: f41d8704150244b51f8b150f8c999887 SHA-1: 1cc2a36ec7980be498daeb779d7f8bf524a5f94a SHA-256: b3fa3cec25570c2495e1cbff017b3ed0b430980993ad16ff46b43f847662bd2f

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript and triggers heuristics related to JavaScript actions and exploit indicators. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript is the primary mechanism for delivering the malicious payload, likely by downloading and executing further stages.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 4

ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `e54b7d01240f66c3abac6156ce583811ecf5a8a570afe5af17b68b74c78a98f4`	pdf-javascript-stream	PDF /JS object 12 at offset 0x9413	849 bytes
`stream_002_off00009668.bin` `070732b3fbbd20295c5b1a911789c30af5b99ce5e14e004bbedc5acf7f113122`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x9668	449 bytes
`font_00_sfnt_off00000349.bin` `4e56128afad897c8ba22338709048333a61f0c1c8de4785f90267c2edf4d9a4e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x349	58553 bytes

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