Thanks to all for your replies. Here's what I wound up doing. After downloading the pdf to my Mac, I saved it to Dropbox. On the Nexus, I found the file in Dropbox. When I clicked on it, one of the options was 'export', and when I clicked on that, the option to export to Evernote appeared.
I can now view the entire pdf in Evernote, even if wifi is turned off.
I'm a happy camper.