There's this program called ProtEXE. Use it after you've finished binding the files.
Basically, it compresses the executable, making it smaller, and of course getting rid of unnecessary code. This effectively changes a bit of the hex code. Now, this isn't guaranteed to work, but there's a good chance it will, as hex-editing can usually make an old file a new one
ProtEXE
If you want to HEX manually, which, if you happen to know what part of the file the anti-virus (AV) keeps detecting, a tutorial is
HERE.
This is extremely useful, and is common knowledge for most people who've been doing this for a while.
Of course, there is programs that cost a lot of money to 'encrypt' the file. Those work okay too, but I hope you can see that you have more options now