Scott have you tried this?
http://www.wikihow.com/Compress-a-PDF-File
Method 3 of 4: Compressing a PDF File Using Mac OS
1
Open your PDF in Preview by double-clicking on it in the Finder menu.
By default, PDF files open in Preview unless you have Adobe Reader or a third party PDF viewer. If that is the case, simply locate the PDF, right click it, click “Open With” and choose Preview.
2
Click File → Export. A dialog box will appear.
3
Click the Quartz Filter option and select “Reduce File Size”.
4
Click “Save”. If you do not rename this file, a dialog box will appear asking if you wish to replace the original document. This will overwrite the current document.[2]
Or This?
Compress a PDF file on MAC
If you are a MAC user then compressing the size of the PDF file is really easy and it does not require any software download as MAC has an inbuilt application (Preview.app) which can be used to compress the PDF file in seconds.
The Real Process:
1. The very first process is open the PDF file with Preview application.
2. After opening the file choose “File” at the top of the screen and then click on “Print” or You can also the use the shortcut key (“Command key” + Letter “P”) to print the file, this will pop up a dropdown menu.
3. On the dropdown menu, you can see a button in the bottom left-hand corner labeled as “PDF”. Click the button and another dropdown menu will appear, immediately below the “PDF” button.
4. Click on the “Compress PDF” from this dropdown menu and now you can see a window indicating the compression is taking place.
5. After the compression a Save window will appear, here you need to type the name of the file and location of the file and click on the Save button.
That’s all, now your PDF file is compressed and ready to send over email.