I also need an extension to execute a perl script with wiki. I would like to display my OTRS Login at a wiki-page.
Why? Are you trying to authenticate users through an external database? It's not clear why you need to execute a perl script to do this.
In any case, I don't think there is an extension you can plugin to mw and then be able to execute a perl script. However, I did have to use this:
http://pecl.php.net/package/perl
to get the AuthBugzilla mediawiki extension working. Maybe you want to do something like that?
Jason