$ pdfcpu info -u mm -p 0-99999 pagesizes.pdf 
pages: 0,1,2,3
pagesizes.pdf:
             Source: pagesizes.pdf
        PDF version: 1.6
         Page count: 3
Page 1: rot=+0 orientation:portrait
 MediaBox (mm) (0.00, 0.00, 210.01, 297.00) w=210.01 h=297.00 ar=0.71  = CropBox, TrimBox, BleedBox, ArtBox
Page 2: rot=+0 orientation:landscape
 MediaBox (mm) (0.00, 0.00, 297.00, 210.01) w=297.00 h=210.01 ar=1.41  = CropBox, TrimBox, BleedBox, ArtBox
Page 3: rot=+0 orientation:landscape
 MediaBox (mm) (0.00, 0.00, 420.00, 297.00) w=420.00 h=297.00 ar=1.41  = CropBox, TrimBox, BleedBox, ArtBox
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
              Title: 
             Author: 
            Subject: 
       PDF Producer: LibreOffice 7.0
    Content creator: Writer
      Creation date: D:20240227100816+01'00'
  Modification date: 
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
             Tagged: No
             Hybrid: No
         Linearized: No
 Using XRef streams: No
Using object streams: No
        Watermarked: No
         Thumbnails: No
               Form: No
           Outlines: No
              Names: No
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
          Encrypted: No
        Permissions: Full access

$ pdfcpu info -j -u mm -p 0-99999 pagesizes.pdf 
pages: 0,1,2,3
{
	"header": {
		"version": "pdfcpu v0.6.0 dev",
		"creation": "2024-02-27 09:09:25 UTC"
	},
	"Infos": [
		{
			"source": "pagesizes.pdf",
			"version": "1.6",
			"pages": 3,
			"title": "",
			"author": "",
			"subject": "",
			"producer": "LibreOffice 7.0",
			"creator": "Writer",
			"creationDate": "D:20240227100816+01'00'",
			"modificationDate": "",
			"keywords": [],
			"properties": {},
			"tagged": false,
			"hybrid": false,
			"linearized": false,
			"usingXRefStreams": false,
			"usingObjectStreams": false,
			"watermarked": false,
			"thumbnails": false,
			"form": false,
			"signatures": false,
			"appendOnly": false,
			"bookmarks": false,
			"names": false,
			"encrypted": false,
			"permissions": 0
		}
	]
}