I hadn't wanted to get into this silly argument, but i'm getting a little tired of your attitude. Explain Bit depth and pixel size in this image if you have a clue what you are talking about. Then explain how such an image can be created other than by incompetent pasting from different file formats.
This one image shows you everything you need to know to conclude the document is a paste up. You just have to have sufficient knowledge of the machine level aspect of computer graphics.
Actually, it's images like that that make me think the BC's anomalies must just be computer artifacts. The 'R' there is clearly of a piece with the background, while the other letters are separate from it somehow. So if it were a paste-up job, that would have to mean somebody pasted in a bitmap 'R' from one source and merged it with the background, but pasted in other letters from a different source and didn't merge them with the background. The idea that someone would create a document that way is, to me, way more improbable than the idea that the scanning, optimization, and PDF'ing process created some inconsistencies.