Can Yahoo mail receive PDF attachments files?

For more explaination, I ordered a concert ticket from ticketfly, which said it should be emailed to me within 24 hours (now 36 hours).

And I just read the bottom of my confirmation email which said make sure your email provider allows for PDF attachments files (the ticket).

Yep, just make sure you have adobe or some type of PDF reader.

Don't most browsers have this so you can read right from it?

Most yes.
However if you were to download the attachment and want to read it, you'll need adobe.
If you are merely just reading it, pretty sure the browser is just fine.

I don't really need to "read" it persay, more just printing out the file (the file is my concert ticket).

Well, you'll have to open the attachment in order to print it. (not sure if there is an option to "print attachments")
For that, you shouldn't have to have any extra programs, such as adobe, it should just open in your browser.

Just to clarify this, you are able to receive pdf files via yahoo email and print them.

You should be fine, the website it just being slow. Yahoo is a major email provider and does (to my knowledge) support PDF Files.