Thankfully, the newest updates in Illustrator make it quite easy to crop an image. It’s not surprising, due to how in older versions before the Creative Cloud, there was no easy cropping option apart from clipping masks. Alternatively, if the PDF was originally created in something like InDesign, which handles bleed and crop marks very well, you can check if the TrimBox is already set (and matches the desired area), and then set the CropBox margins to the same values as the TrimBox margins. Knowing how to crop in Illustrator seems to be a bit of a confusing topic for new Adobe Illustrator users. Under Tools → Print production, choose Set Page Boxes, select the CropBox in the drop-down menu, and set the margins to match the crop area. You can actually also do this in Acrobat Pro without needing to open up Illustrator at all. (Of course, you shouldn’t delete the crop marks until after you’ve adjusted the artboard size if you actually need the size to match the crop area, rather than the edges of the poster background.) It should snap to the edge of the artboard elements, so it shouldn’t be too difficult. Select the Artboard tool ( Shift + O, at least on a Mac I presume it’s the same on Windows) and simply adjust the edges of the current artboard to align with the edge of the poster. You will then be able to select the crop marks and delete them as they are just regular line elements in the PDF file. Since you say you have the poster as a PDF file, I’m going to assume it’s a properly created PDF file (i.e., one that contains vector elements where possible, rather than one where everything is just rasterised as an image).
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