Illustrator Embedded Image Resolution Issue

Hi there!

I am currently checking  in Illustrator some artworks created by a client , for large scale prints.

Some of these artworks have been created using InDesign instead of Illustrator.

Some of the images (mainly jpgs) embedded in the PDF have a low resolution, around 50ppi.

However if I copy a low quality image (ipg) from the pdf file (opened in Illustrator) and paste it in Photoshop, the image suddenly has a higher resolution.

I understand that this might be an issue related to how the pdf is exported from Indesign but I am not sure why this si happening and how to solve this issue without saving and relinking every single image embedded.

Here below is the resolution of the same image in Illustrator and in Photoshop

Has anyone ever experienced this issue or  have any suggestion on how to work around this problem (eg. Export Indesign settings) ?