Today Google has announced two new tools a webmaster can access via the new Labs section on Google Webmaster tools.

Fetch as Googlebot

This function let you create a simulate crawl for single pages of your website. Just submit the page and with a few minutes you get a report about what Google gets if the bot has crawled your page.

 The interesting thing is that the output show the web page headers as well:

Malware details

This section will show you the pages where malware was detected if Google has found any malicious code on your websites.
Cool last time it took hours to find it all. Anyway it's always better to scan your server for malware.