Therefore, it is more important than ever to ensure that your PDF reader is secured from launching malicious code. If you are using the latest Adobe Reader, you can ensure that you are protected by going to Edit -> Preferences -> Trust Manager and uncheck “Allow opening of non-PDF file attachments with external applications”.
If you use the more lightweight alternative Foxit PDF Reader, the method is similar. In Foxit when you click on an external link you see the following dialog:
So, in Foxit you are protected by default. However, if you are sure that the file you are trying to open is secure you can disable this feature by navigating to Tools > Preferences > Trust Manager and uncheck “Enable Safe Reading Mode”.
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