I have to explore the different tactics that a hacker will use to get passwords.

My question is:  Can malicious code attach to a ACCDE file.  Now I know that embedded macros do not allow malicious code.  I have put numerous Macros in my database.
However some things do not operate in SQL well. Thus I have to use VBA.

My other Question: Can I hide my tables from the user in a ACCDE file.

I can encrypt Passwords and usernames. Which is another layer of  security