Here are two links to possible fixes:
http://tomaltman.com/pharma-hack-fix-for-wordpress/
http://www.pearsonified.com/2010/04/wordpress-pharma-hack.php#more-742
If you found this post helpful please pass it on. Also if you have any tips, tricks or resources you would like to share with the guild please email them to chrisw_88@hotmail.com