Manually add a file type to a black or white list, Reset (restore) attachment permissions, Allow attachments to start applications – Adobe Acrobat XI User Manual
Page 394: Allow or block links to the internet in pdfs
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Security
Last updated 1/14/2015
For details, see the Application Security Guide at
Manually add a file type to a black or white list
Administrators can modify the black or white list through the registry. Users can manually add a new file type to a black
or white list by attaching the file and then trying to open it.
1
Choose Tools > Content Editing > Attach A File.
2
Add a file type that is not in the black or white list.
3
Right-click the file in the Attachments pane on the left and choose Open Attachment.
4
In the Launch Attachment dialog box, select one of the following options, and then click OK:
Open This File:
Opens the file without changing the registry list.
Always Allow Opening Files Of This Type:
Adds the file type to the white list and prevents future warnings.
Never Allow Opening Files Of This Type:
Adds the file type to the black list and does not open it. You can possibly
attach a file of this type to a PDF, but you can’t open it.
Note: To restrict a file type that you permitted in the past, reset (restore) attachment permissions in the Trust Manager
Preferences.
Reset (restore) attachment permissions
Because the list of allowed and disallowed file attachment types can grow over time, you can reset the lists to their
original state. This state can sometimes provide the highest level of security.
1
Choose Edit > Preferences (Windows) or Acrobat/Adobe Reader > Preferences (Mac OS).
2
From the Categories on the left, select Trust Manager.
3
In the PDF Attachments panel, click Restore. The Restore button is available only if you changed the attachment
defaults.
Allow attachments to start applications
The Trust Manager lets you control whether non-PDF attachments can start their associated applications.
1
In the Preferences dialog box, select Trust Manager from the Categories on the left.
2
Select the option Allow Opening Of Non-PDF File Attachments With External Applications. You must have the
external applications to open the files.
Allow or block links to the Internet in PDFs
Note: For a full list of articles about security, se
Clicking any link to the Internet poses a potential security risk. Malicious websites can transfer harmful content or
silently gather data. If you are concerned about these risks, you can configure Acrobat and Reader to display a warning
when a PDF attempts to connect to an Internet site.
You can allow Acrobat and Reader to contact selected websites by adding their addresses (URLs) to your list of trusted
websites in the Trust Manager preferences. Alternatively, you can allow all URLs.