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Yes. Older or "free PC" executors are common malware vectors. Stick to mobile or well-known paid PC tools.
Exploiting Roblox is an arms race. By the time you read this, some of the executors listed may be patched. Always verify before injecting. Stay safe, and respect other players’ experiences. Roblox All Executors
—essentially their level of permission within the Roblox engine: Roblox Wiki Levels 2–4 : Standard game scripts and LocalScripts. Roblox All Executors
Executors are typically categorized by their platform and how they manage script access: Roblox All Executors