First of all, excellent link! Virtual machines with custom instruction sets -- seem to be a broader problem -- that they can apparently exist within a PDF file

First of all, excellent link! Virtual machines with custom instruction sets -- seem to be a broader problem -- that they can apparently exist within a PDF file is one specific instance of this broader problem... A selected quote from the article linked: >"Short of not using a device, there is no way to prevent exploitation by a zero-click exploit; it's a weapon against which there is no defense." To the author of that article: Well, "short of not using it", that is! <g>