In this particular case, escaping the . to what I assume it was meant to do should work:
.
ps aux | grep '7000\.conf' | awk '{print $2}'
Alternatively, exclude grep:
grep
ps aux | grep 7000.conf | grep -v grep | awk '{print $2}'
ps aux | grep "[7]000.conf" will work as well.
ps aux | grep "[7]000.conf"