I want to replace all the logos in the file with another png can you help?

I was going to ask the same thing about artwork origination. If the "loggos" are created as vector-based designs they should print razor sharp from the outset without having to attempt editing exported PDFs. It sounds to me like someone in the work-flow chain has a nasty habit of using low resolution, pixel-based images as logo graphics.

Far too much of the general public has zero awareness at all about the differences between vector-based and pixel-based artwork. So they don't think twice about the consequences of using and storing graphics assets such as logos as low quality, pixel-based images. When I ask clients for digital artwork of their logos about 90% of the time they'll email a JPEG image sized for a modest footprint on a web page. Those clients often get annoyed when I reject that artwork, asking for something more professional, something vector-based. "What is vector art?" Me: (face-palm). To them a digital computer file is a digital computer file; it's "perfect" since it's "digital." So I need to stop being incompetent and figure out how to make their garbage art look clean and professional. I also get annoyed by freelance designers creating artwork for small businesses as a side-hustle, that do so using very counter productive methods: like doing all their "logo" design work in Photoshop rather than a vector application like Illustrator. I've had frustrating conversations with some of these people. They're used to Photoshop (or whatever pixel-based image editor they're misusing) and don't want to use/learn any additional applications. I warn them they're causing their clients all kinds of problems and costing them money. Our shop does not do vector re-creations of JPEG logos or other assets for free. Sometimes the freelancer will create the original artwork in vector format but then all he wants to do is export pixel-based JPEG or PNG images to anyone needing copies of the artwork.