So, you're in Acrobat Pro and you're Exporting as .jpg? Or, are you opening the .pdf in Photoshop and saving as .jpg? Are you viewing it as an RGB or a CMYK file? Sounds like a CMYK file. Check your color settings and select "Black Point Compensation". Also, in Photoshop, try "Perceptual" as your Rendering Intent. In Illustrator, use "Black Point Compensation" but, instead of Perceptual. try "Relative Colorimetric" as your vector Rendering Intent. It's a long shot, but your dot gain setting may be too high ( should be around 20% ). There are several possibilities in play and too many variables to nail the problem down from here. I wonder if it may be a view problem, have you done a hard copy proof of the .pdf to see how it prints in all three applications ( Acrobat, Photoshop, and Illustrator )?
Thank you for your answer John!
PDF was created in Illustrator CS3(not by me)
I imported PDF to Photoshop and save as a JPG(using option save for web),(I have sRGB option unselect)
I tried viewing file as CYMK, RGB...not difference at all after saving as JPG, still there is color difference....
In Photoshop CS3 I have color setting:
After your advice
I re-saved PDF with new settings as you said, the result is better but still colors are a bit different.
Are you preserving the profile of the PDF when you open the file.