Adobe has issued a security warning in regard to PDF files that have other files attached to them. Security researchers have found new ways for common PDF documents to release malicious code without the knowledge of the person opening them.
As Adobe investigates this, you must use the following method to disable this risk.
Open up Adobe Reader. Click on Edit on the upper menu bar and then click on the Preferences option at the bottom of the drop down. Click on “Trust Manager” in the left pane. Clear the check box “Allow opening of non-PDF file attachments with external applications” Click Ok to exit the screen.
For Mac users, the Preferences option can be found under the Adobe Reader name on the upper menu bar.
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