Attachment: PDF including a Microsoft lure with specific signature

calendar Oct 1, 2026  ยท
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Detects inbound messages containing PDF attachments that match a YARA rule associated with Microsoft-themed lure content.

Sublime rule (View on GitHub)

 1name: "Attachment: PDF including a Microsoft lure with specific signature"
 2description: "Detects inbound messages containing PDF attachments that match a YARA rule associated with Microsoft-themed lure content."
 3type: "rule"
 4severity: "medium"
 5source: |
 6  type.inbound
 7  and any(filter(attachments, .file_type == "pdf"),
 8          any(file.explode(.),
 9              any(.scan.yara.matches, .name == "pdf_msft_lure_signature")
10          )
11  )  
12attack_types:
13  - "Credential Phishing"
14tactics_and_techniques:
15  - "PDF"
16  - "Impersonation: Brand"
17  - "Social engineering"
18detection_methods:
19  - "YARA"
20  - "File analysis"
21id: "34810dba-296e-539f-b85e-0074a30afcc7"
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