Scanning to PDF format Canon MX300

SOURCE: what is the scan procedure for the canonpixma mx300?

First make sure you download the right driver/software for MX300 according to your OS. Then with the printer connected to the computer u can proceed:
press the scan button on the printer
then on your pc click my computer and u should then see the printer scanner at the end, right click on that and you will get the scan option.

I too couldn't do it for a bit then kept fiddling till i was able to and I have Windows XP.

Hope this helps.

SOURCE: Scanning Multiple pages into one pdf

Typically it is possible, in advanced settings for scanning it will typically give you an option to scan multiple pages into one document.

SOURCE: Default Settings for Canon Imagerunner 3025 Scanning

You will find those settings in your scanning software on your computer, since all of them are different, there is no one right answer. Some you have to choose each time you start a new job or document.