website viewing with android phone

Hi. I’m still a bit new with this but I hope someone can advise me. I tested my new WordPress site out and it seems to work well in all the browsers I tried (Internet explorer, firefox, google chrome) and it also views well on my android smart phone, apart from one page (computer tips) where I have a couple of embedded pdf documents. The android phone says that it cant read these and I cant find a plugin for it that will work. Is there any way to make these readable with any android version without the user needing to find a plugin for their phone. The site is https://www.billhughes.co.uk if you need to take a look.
Thanks in advance for any advice