Yes, PDf submission are very effective in order to improve the ranking. PDF's get cached quickly and rank easily in the search engines. But if you are not optimizing the content and promoting the PDF's properly it wont help you to generate traffic.
In order to make PDF help your website from SEO point of view, you need to create slides with textual content as well. As images are not read by Google, so you need to write content to inform spiders what slides contains.