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Detection rules › Sublime MQL

Attachment: PDF with CVE-2026-34621 lures

Severity
high
Type
rule
Source
github.com/sublime-security/sublime-rules

Detects PDF attachments containing YARA signatures associated with CVE-2026-34621's observed lures.

Threat classification

Sublime's own taxonomy (not MITRE ATT&CK).

CategoryValues
Attack typesMalware/Ransomware
Tactics and techniquesPDF

Event coverage

Message attribute
attachments (collection)
type

Rule body MQL

type.inbound
and any(filter(attachments, .file_type == "pdf"),
        any(file.explode(.),
            .depth == 0
            and any(.scan.yara.matches,
                    .name == "pdf_cve_2026_34621_observed_lures"
            )
        )
)

Detection logic

Scope: inbound message.

Detects PDF attachments containing YARA signatures associated with CVE-2026-34621's observed lures.

  1. inbound message
  2. any of filter(attachments) where:
    • any of file.explode(.) where all hold:
      • .depth is 0
      • any of .scan.yara.matches where:
        • .name is 'pdf_cve_2026_34621_observed_lures'

Inspects: attachments[].file_type, type.inbound. Sensors: file.explode.

Indicators matched (2)

FieldMatchValue
attachments[].file_typeequalspdf
file.explode(filter(attachments)[])[].scan.yara.matches[].nameequalspdf_cve_2026_34621_observed_lures