Nice poster.
The Print Black named color is 0,0,0,100 (CMYK black). The image is RGB black 0,0,0. You will always get a difference in black color that way. Changing the background rectangle to RGB 0,0,0 I get correct output as shown in the screen shots. the screen shots are from within Acrobat and was exported using the PDFX-1a profile. The red-circled color picker is inside of Acrobat. One shows hovering over the bitmap, the other over the rectangle.
So try selecting the rectangle, open the color editor and choose RGB. Set it to 0,0,0. And note that it will likely already be those values once you pick the other color model, so move one slider a little and then move it back.
Mike
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