Advice on a good PDF reader/maker and Office?

Hi, my adobe acrobat is pretty laggy. Whenever I load PDF to read, it gets very slow. Is there any alternative that you guys use to read and write PDFs?

Another thing, I need MS Word and Excel and I can't buy the subscription now and all the cracked versions are filled with viruses, tho I don't know why the uploaders in those torrent sites mainly 1337x.to and such claims false positives every freakin time. Virus total gives so many detections and they say KMS is a false positive.
Any of you using cracked version of MS office? If yes, then where did you download it from?

Thanks in advance!