Way too big. Speaking as a user, PDF documents are a pain in the you know what to view and load. Better to convert it to something more useful and smaller.
What sort of document is it: a single sheet, such as an ancestor's naturalization certificate, or something like a copy of a twenty-page thesis or essay?
To turn the document into HTML as Corwings suggested, you would need to use OCR (Optical Character Recognition) to convert the text back from an image to proper text that can be placed on a web page, and quite efficiently. I have done that with about 40 pages of text, and each page takes about 5 KB in HTML. It works best if the scanned image is rather clear, and the typeface is something like Times Roman or Courier.
The pictures will require more space than that, but you should be able to start with the scanned image (a TIF file?) and crop the images down to a bunch of JPGs, if they are photos, or GIFs if they are line art.
If you e-mail me the PDF file, I'll check it out and see what I can do with it.