New file on my Macbook Pro with odd custom permissions. Have I been hacked?
/Library is where system files are kept - configurations for applications, etc. Generally, unless something is broken, you wouldn't need to access /Library for anything. Your main location for your files - the ones you need to access is actually /Users. Hence, permissions for System Only are right for /Library
I would likewise not be concerned about something that says &quot;Logs&quot; on it. Logging is a useful tool for diagnostics - or to put it another way - to work out what is going on or where something may have gone wrong.