I believe that attachment.php is the template for attachment pages. So you can edit existing one or create new if you have none.
You can also create different templates for different mime types: http://codex.wordpress.org/Template_Hierarchy
Edit:
Sorry, in a case you want to change HTML page title, you may want to use is_attachment() in header.php of your theme.
Something like this:
<title><?php if( is_attachment() ) { ... } else { ... };?></title>
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