Attachment: PDF with suspicious document view lure

calendar Jul 14, 2026  ·
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Detects PDF attachments containing a title box designed to lure recipients into viewing a document, a common social engineering technique used to direct users to malicious content.

Sublime rule (View on GitHub)

 1name: "Attachment: PDF with suspicious document view lure"
 2description: "Detects PDF attachments containing a title box designed to lure recipients into viewing a document, a common social engineering technique used to direct users to malicious 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_view_doc_here_title_box")
10          )
11  )  
12attack_types:
13  - "Malware/Ransomware"
14tactics_and_techniques:
15  - "PDF"
16  - "Social engineering"
17detection_methods:
18  - "Content analysis"
19  - "File analysis"
20  - "YARA"
21id: "c9a7ca6f-7291-5788-ba55-a965316d4fee"
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