iOS Safari Repeatedly Opens "Virus Detected" Emails
Basically, this is a website that repeatedly spawns email templates by repeatedly opening a new tab with a mailto: link, causing iOS to open email templates repeatedly. This is a known vulnerability in iOS, fixed in iOS 10.2. 

To fix the issue without updating your software, go to Settings -> Safari -> Clear Website and History Data. Alternatively, on an iPhone 6S (or newer) with 3D Touch, you can force-press on the Safari icon, open a New Tab, then immediately press down and hold the tab switcher icon, and hit Close All Tabs.

Learn more about this issue.

Note: This is fixed in iOS 10.2 (which, sadly, your iPad 2 can't update to), which prevents websites from opening mailto: links until the user specifically approves it.