Sometimes you might run into font substitution issues in a PDF form, usually when a font on one platform (ex: PC) is specified and is not present on another platform (ex: MacOS). Unsightly/illegible font substitutions may occur in the form fields as a result. Below is a quick fix to switch the typeface to something more suitable for cross-platform performance. This online resource at Mailchimp has a nice list of current cross-platform fonts they recommend.
Open up the PDF in Acrobat DC.
Click on the Prepare Form toolset icon in the right sidebar
All of your form boxes should now have a small black bar with white text defining each box centered in them.
Double-click on a box where the type is incorrect to open up the editing window.
Click on the Appearance tab.
Select a different font from the dropdown menu, perhaps Courier or Arial. Use a really common system font, then click Close.
Repeat as necessary.
Save the file.
Still having issues? File a Helpdesk ticket with us: http://deskpro.cad.rit.edu