While there is not a filter option which can limit to specifically PDF formats, there are ways to limit your search results to only Full text articles.
Assuming that you start in the library catalog, you can use the left-side search facets to limit your search to full text articles owned by Fuller. You can do this by selecting "Fuller libraries," "full text" (under "content"), and "article" (under "format"). Please note: some searches may require you to click "see more" in the specific category to see the desired option.
Along the same lines, each database provides an option to limit to full text. In the ATLA database, for instance, the homepage search options include one to limit results to Full Text:
On the Fuller database page, you can also combine the full text "Database Types" filter with Journal/ eJournal resources to limit your results to full text journal databases.
