Attachment: Encrypted PDF with Adobe lure

calendar Nov 12, 2026  ยท
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Detects inbound emails containing PDF attachments that match YARA signatures identifying encrypted PDFs designed to lure recipients with Adobe-themed content

Sublime rule (View on GitHub)

 1name: "Attachment: Encrypted PDF with Adobe lure"
 2description: "Detects inbound emails containing PDF attachments that match YARA signatures identifying encrypted PDFs designed to lure recipients with Adobe-themed 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_enc_adobe_lure")
10          )
11  )  
12attack_types:
13  - "Credential Phishing"
14tactics_and_techniques:
15  - "PDF"
16  - "Encryption"
17detection_methods:
18  - "YARA"
19  - "File analysis"
20id: "a7fbb877-7e57-59b4-a4c3-4045bb265055"
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