After many tests in all kind of PDF presets, I couldn't figure out how to keep the text layers as vector and still have the quality of InDesign without using it. Everything I tried was rasterizing the texts. It seems like PDF/x rasterizes the layers too.
The layout needs to be created in Adobe Photoshop unfortunately, and all I have on hand is a Photoshop file with layers.
Is it possible to keep the vector quality of Photoshop text layers and objects when exporting to PDF, and get the quality of an Illustrator or InDesign file easily?