In adobe form if you want to have one link which opens another link or pdf file.
Then below mention procedure can help you in simple manner.
A hyperlink (or link) is a word, group of words, or image that you can click on to jump to another document.
When you move the cursor over a link in a Web page, the arrow will turn into a little hand.
Now follow the procedure.
Go to palettes choose-> script editor
Now click on the hierarchy->body page
<a href=”url”>Link text</a>
<a href=”http://scn.sap.com/“>Visit SAP</a>
This will display like this: visit SAP
Clicking on this hyperlink will send the user to Visit SAP homepage.
Tip: The “Link text” doesn’t have to be text. It can be an image or any other HTML element.
In layout create one text and provide text name (link text).
Save and activate. Now execute the adobe form.
SAP ABAP Consultant