I saw one rumor where they uploaded a gibberish file for some reason. In another, there was a Windows update that shipped just before they uploaded their well-tested update. The first is easy to avoid with a checksum. The second…I’m not sure…maybe only allow the installation if the windows update versions match (checksum again) :D
Wtf…pdfs allow js to execute? Who thought that was a good idea? How about it runs flash too while we’re at it?