Attachment: PDF Object Hash - Generic MSFT lure

calendar Oct 1, 2026  ·
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Detects inbound emails containing PDF attachments where the PDF object hash matches a specific known object hash previously associated with generic Microsoft lures.

Sublime rule (View on GitHub)

 1name: "Attachment: PDF Object Hash - Generic MSFT lure"
 2description: "Detects inbound emails containing PDF attachments where the PDF object hash matches a specific known object hash previously associated with generic Microsoft lures."
 3type: "rule"
 4severity: "medium"
 5source: |
 6  type.inbound
 7  and any(filter(attachments, .file_type == "pdf"),
 8          any(file.explode(.),
 9              .scan.pdf_obj_hash.object_hash == "fc52ac1737c442a200c7392061766221"
10          )
11  )  
12attack_types:
13  - "Credential Phishing"
14tactics_and_techniques:
15  - "PDF"
16detection_methods:
17  - "File analysis"
18id: "11d517b4-5d86-5367-a44c-61faf1db12db"
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