This malware when decoded loads a javascript malware from the SoakSoack.ru domain. If you believe that your website is infected check your site against a scanner that detects the latest redirection. The link below will take you to an online scanner that will check your website for known malware, blacklisting status, website errors, and out-of-date software.
Go to Sucuri SiteCheck scanner here - http://sitecheck.sucuri.net/