I'm going to copy-and-paste the important bit in case nonsubscribers need to read it. I wouldn't normally do this, but I figure it's an important announcement rather than a creative work:
On Oct. 31, 2015, one of economist.com’s vendors, PageFair, was hacked. If you visited economist.com at any time between Oct. 31, 23:52 GMT and 01:15 GMT, Nov. 1, using Windows OS and you do not have trusted anti-virus software installed; it is possible that malware, disguised as an Adobe update, was downloaded onto your PC.
On Oct. 31, 2015, one of economist.com’s vendors, PageFair, was hacked. If you visited economist.com at any time between Oct. 31, 23:52 GMT and 01:15 GMT, Nov. 1, using Windows OS and you do not have trusted anti-virus software installed; it is possible that malware, disguised as an Adobe update, was downloaded onto your PC.