With jpeg files you can't fix blowouts. So if you shot any where the sky is blown out, there's nothing you can do about that.
Otherwise, you can edit them just fine, don't worry.
Just use Photoshop to open the PDF. When you get the Import PDF screen, make sure you select ALL the pages at once:
(Your screen will look a bit different to this.)
Then when all the pages open in Photoshop, you can use File>Scripts>Image Processor to quickly save them all in the format you want.
Add a Channel Mixer layer, and go to "Output channel: Blue". Change it from 0/0/+100/0 to 0/+90/0/0 (make sure you get those numbers in exactly the right order). Mask it to the area.
Then add a new blank layer above that, and choose your Clone Tool. Make sure it's set to "Sample: Current & Below" in the options bar. Then do your best to carefully clone the rest of the issues.
The dark and moody colour can be done in Photoshop of course.
But the lighting has to be appropriate. I mean, Photoshop can enhance the shadows to make them moodier, but the shadows have to exist in the first place.
You're still missing the point.
In your photo, there is NO light in front of the guy, apart from very vaguely reflecting light.
You need to find a backlit example photo.