Perhaps you wanted something like this:

open STUFF, "<", $file or die "Can't open $file: $!";

while (<STUFF>) {
  chomp;
  $seen{internal_name}++, next if /^internal name/;
  if ($seen{internal_name}) {
    if (/^need this/) { # do your stuff here }
  }
}
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At the start, nothing is done until /^internal name/ is seen. If we see one, we just take note of that in a hash key, which we test later on when we get to do the real work. Update: I suddenly remembered there was a predefined DATA filehandle...