You cannot send attachments with any email provider. They would get caught in spam filters.
I suggest uploading the file to your server or Marketo's and using the link. It's easier to track if the lead did something that way too.
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@josh - Lots of email providers do allow you to send with attachments (ExactTarget for example)
@santhosh - as Josh noted you haver to be very wary of sending them as they can be seen as a high Spam score/threat (many attachments will be stripped from the emails as well). Best practice would be to upload and use a link.