Files blocked in robot.txt and seo

[seoanalytics]

I use joomla and I have blocked the following in my robots.txt is there anything that is bad for seo ?

User-agent: *

Disallow: /administrator/

Disallow: /cache/

Disallow: /components/

Disallow: /images/

Disallow: /includes/

Disallow: /installation/

Disallow: /language/

Disallow: /libraries/

Disallow: /media/

Disallow: /modules/

Disallow: /plugins/

Disallow: /templates/

Disallow: /tmp/

Disallow: /xmlrpc/

Disallow: /mailto:myemail@myemail.com/

Disallow: /javascript:void(0)

Disallow: /.pdf

[john4math]

If you don't want pages in those Disallowed directories to be indexed, then you're doing fine.  These pages won't be able to be crawled, so, they won't be likely to appear in search results for any search engines.

The last three entries look fishy to me.  I'd need to know what types of URLs you're trying to block to fix them.  For the last one, if you're looking to block all pdfs on your site, the syntax would be Disallow: /*.pdf.

[seoanalytics]

Thank you and is blocking javascript bad ? ( I was thinking about submenus )

[john4math]

What you have there is just blocking rootdomain.com/javascript:void(0).  Googlebot can execute and index JavaScript; you should not block it without a good reason.  I'd let it read the JavaScript and see the submenus.