Google announced that Gmail services can now search through mail attachments as well as regular mail. With this new update users can now scan through all mail attachments without going and searching through the mail. The attachment search feature works within PDF files, Microsoft .doc ppt files and other older attachments which haven’t been indexed as yet.
[box_dark]You will have to simply type in the following commands in the search box:
“To find messages that have attachments, search for has:attachment and add some keywords to your query. To restrict your search to PDF files, search for has:attachment filename:pdf.”[/box_dark]
Source: Google Operating System