On Mojave and Catalina, you can use SwiftDefaultApps to change the default PDF reader.
Making sure Preview.app is the default PDF reader for users that do not really need anything more advanced for everyday use, is a good security precaution – even for users that need the full version of Acrobat for specific purposes. It is also much lighter than Acrobat Reader, and a great application.
Luckily, Apple’s Preview.app, which is the default PDF reader on macOS, does not support most of Acrobat’s features that can enable this type of malware. Malware can sometimes come in the form of a PDF that contains embedded scripting language.
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