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suspicious producer

yara LOW Yara-Rules
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This rule was pulled from an open-source repository and enriched with AI. Validate in a test environment before deploying to production.
View original rule at Yara-Rules →
Retrieved: 2026-05-12T11:00:00Z · Confidence: medium

Hunt Hypothesis

The suspicious producer rule detects potential adversarial activity where an unknown or unexpected process is generating output that may indicate malicious behavior. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate early-stage threats that may evade traditional detection methods.

YARA Rule

rule suspicious_producer : PDF raw 
{
	meta:
		author = "Glenn Edwards (@hiddenillusion)"
		version = "0.1"
		weight = 2
		
	strings:
		$magic = { 25 50 44 46 }
		$header = /%PDF-1\.(3|4|6)/
		
		$producer0 = /Producer \(Scribus PDF Library/
		$producer1 = "Notepad"
	condition:
		$magic in (0..1024) and $header and 1 of ($producer*)
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 4 string patterns in its detection logic.

False Positive Guidance

Original source: https://github.com/Yara-Rules/rules/blob/main/maldocs/Maldoc_PDF.yar