Hi shaka.serrant
Two Ways :
Reduce file size by saving
You can sometimes reduce the file size of a PDF simply by using the Save As Other command. Reducing the size of PDFs improves their performance—particularly when they’re being opened on the web—without altering their appearance.
The Reduce File Size command resamples and recompresses images, removes embedded Base-14 fonts, and subset-embeds fonts that were left embedded. It also compresses document structure and cleans up elements such as invalid bookmarks. If the file size is already as small as possible, this command has no effect.
Note: Reducing the file size of a digitally signed document removes the signature.
- Open a single PDF, or select one or more PDFs in a PDF Portfolio.
- Choose File > Save As Other > Reduced Size PDF.
- Select the version compatibility that you need.If you’re certain that all your users use Acrobat XI or Adobe Reader XI, limiting compatibility to the latest version can further reduce file size.Note: In Acrobat Pro, if you select Acrobat 4.0 And Later, and the document contains transparency, the transparency is flattened.Note: In Acrobat Standard, if you select Acrobat 4.0 And Later, and the document contains transparency, the conversion will fail.
- (Optional) To apply the same settings to multiple files, click Apply To Multiple, and add the files. Click OK, then in theOutput Options dialog box, specify your folder and filename preferences.
For More Details : http://help.adobe.com/en_US/acrobat/using/WSFCDFBF6D-795A-4364-BA93-BB157AAD53ED.w.html
Or
refer the below link : http://help.adobe.com/en_US/acrobat/using/WS58a04a822e3e50102bd615109794195ff-7c88.w.html#WS58a04a822e3e50102bd615109794195ff-7c87.w
Tv Tutorial : http://tv.adobe.com/watch/acrobat-x-tips-tricks/quick-tip-how-to-compress-a-pdf-file/