It's possible you're thinking of a specific legal term or concept that you've heard, but are misremembering the name.
To help me understand what you're looking for, could you provide more context? For example:
* Where did you hear the term "craven act"? (e.g., in a book, movie, legal document)
* What was the situation or context in which the term was used?
* What do you think the "craven act" might be referring to?
Once I have more information, I can help you find the answer you're looking for.