The question is still open, but for now I used a workaround:
<VirtualHost IP:80>
ServerName http://domain.info
[Redirect to local html that contains frame forwarding]
</VirtualHost>
<VirtualHost IP:80>
ServerName http://subdomain.domain.info
Redirect / http://domain:port
</VirtualHost>
Now this works
<VirtualHost IP:80>
ServerName http://stats.domain.info
Redirect / http://domain.info/cgi-bin/awstats.pl
</VirtualHost>
So that I can remote-access AWstats using
http://domain.info/cgi-bin/awstats.pl