Pinboard Theme Hacked How To Replace function.php file

You can download the theme from here:
https://wordpress.org/themes/pinboard

Once download it, extract the files and look for the functions.php file. If you have FTP access, upload it and overwrite it that way.

Otherwise, if you have access to your wordpress dashboard you can go to Appearance >> editor and look on the right for functions.php.

Open the new functions.php file with notepad or similar, copy everything and paste it in place of the old file and press save.

FTP is the quickest and easiest way if you have it set up, would take about 30 seconds to do

If your site was hacked, you need to make sure you’ve completely cleaned it up and secured the site or it will likely happen again.

See:

http://codex.wordpress.org/FAQ_My_site_was_hacked
http://wordpress.org/support/topic/268083#post-1065779
http://smackdown.blogsblogsblogs.com/2008/06/24/how-to-completely-clean-your-hacked-wordpress-installation/
http://ottopress.com/2009/hacked-wordpress-backdoors/

Additional Resources:
http://sitecheck.sucuri.net/scanner/
http://www.unmaskparasites.com/
http://blog.sucuri.net/2012/03/wordpress-understanding-its-true-vulnerability.html
http://blog.sucuri.net/2010/07/understanding-and-cleaning-the-pharma-hack-on-wordpress.html
http://codex.wordpress.org/Hardening_WordPress