Adobe Reader is to PDF documents in the same way that Internet Explorer is to HTML pages... Exploits are designed to target and exploit the consuming applicati

Adobe Reader is to PDF documents in the same way that Internet Explorer is to HTML pages... Exploits are designed to target and exploit the consuming application of the malicious file, and are not executable by the file format itself (in these particular cases at least) in any arbitrary application that can open the file. So odds are that a 0-day exploit of Adobe Reader using a specially crafted PDF will have no effect in Apple's Preview app, or another PDF viewer (unless the apps were all using an underlying shared library and that's where the exploit lived, but I don't think this is the case here).