The default Adobe Illustrator fonts found when installed

I've experienced this once before, it can happen when you have a font file in your system that is somehow corrupted. Once Illustrator tries to load it (triggered by your scrolling). Photoshop is apparently more tolerant. The solution is unfortunately not convenient; you need to identify which font file is causing Illustrator to freak out and uninstall it from your system.

As a preventative measure, I always load fonts used for design in Illustrator's font directory (that's Program Files\Adobe\Adobe Illustrator CC 2015\Fonts on Windows, see this question for alternatives) instead of installing it on the system. That way if I do add a font that provokes this behavior, it's easier to identify and remove.

• If they are free fonts, you will get them on DaFont. To me, both seem like proprietary fonts, so once you get them downloaded, read on.

• Search with the font names the error is showing you.

• Once you get the font files downloaded, extract the .zip if its conpressed.

• The font files are in .ttf format.

• Just double click on the .ttf file and install it. Any other extension also use the same procedure. And restart your Illustrator.

• Attaching a screenshot.

Update: The fonts will remain the same when you open it in Adobe Reader, since the font files are normally embedded in the PDF itself.

Update 2:

I'm attaching the screenshots, of the error msg your getting but will not make any changes to you PDF file if you quit (Assuming you did not edit anything in Illustrator)

If you do make changes, you will get this dialog box while closing the file or quitting Illustrator. Click Don't Save Screenshot below.

If you do not make any changes you will NOT get this dialog, and NO changes will be made to your original file.