Google have an interesting webmaster tool safe browsing you can use it to check from time to time if your website or server is victim of malicious software or exploits. Sometimes your server might be attacked and the owner is not aware about it, so if you want to check simply open :
And put your website after site=, the diagnostic page will include the current status, previous status during the last 90 days. Exploits are mainly scripting exploits, and google record also the server IP which host the malicious software.
The diagnostic will tell you also if your website have acted as intermediary in the distribution of malware, probably not very useful information for you, but it is safe to know if something was going wrong.
I think it’s an excellent diagnostic that you can get for FREE for your website to make sure that it is safe to browse on your website.