Linked documents that have been created by the library should be in Word, not PDF, format. NYU's LibGuide on accessibility has extensive directions on what to do to remediate PDFs.
Ensuring that all aspects of your guide - including library-created resources that you link to - are accessible is valuable for the user experience. If your guides include links to library-created resources, including PDFs, Google or Word Docs, and so on, please update the accessibility of those items.
For assistance with this, use resources from SLCC on accessible documents and/or the linked resources from NYU.