For a full list of articles about security, see Overview of security in Acrobat and PDF content.
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 Acrobat Reader to display a warning when a PDF attempts to connect to an Internet site.
You can allow Acrobat and Acrobat 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.
If the options in the Manage Internet Access dialog box are disabled, select Custom Setting. If options are still disabled, your product could be under an administrator’s control with those restrictions in place.
To allow access to all URLs, select Allow PDF Files To Access All Web Sites.
To restrict access to all URLs, select Block PDF Files’ Access To All Web Sites.
To restrict access to only the URLs you specify, select Custom Setting.
To add a website, type its URL in the Host Name text box and click Allow or Block.
To remove a URL you no longer want to visit, select the website in the list and click Delete.
To specify what the program should do with websites not in your custom list, select one of these options: Always Ask, Allow Access, Block Access.
For more information, see the Application Security Guide at www.adobe.com/go/learn_acr_appsecurity_en.
If you open a protected PDF and receive a prompt to allow or block a URL, select Remember My Action For This Site. This reply adds the URL to this list.