Foxit Reader, free: http://www.foxitsoftware.com/Secure_PDF_Reader/
Just be sure to not install or enable stuff within Foxit you may not need. If all you need is a pdf reader, stick with that.
Updates are pretty frequent, just check c|net for update notifications by Carol in Spyware, viruses, and security forum (daily)
Does everything you need it to do without the bloat.
I hate the PDF reader on windows8. It opens the PDF and I cannot minimize it or put another program in front of it. Is there a way to minimize it or a better pdf reader aside from adobe?