copy folder name to file name

I have 100s of PDF files nested three folders deep that I need to rename with the folder's name 2 levels up. How can I automate this? All help appreciated!
1/ All folder and file names are unpredictable (i.e., not sequentially or otherwise pattern named)
2/ There is 1 parent folder above all (see below)
3/ Folders are always 3 deep
4/ There are never files in intermediate folders
5/ There is only 1 file in each target folder
Folder name 00
--Folder name A1
----Folder name A2
------Folder name A3
--------File name nnn.pdf >> rename this "Folder name A1.pdf"
--Folder name B1
----Folder name B2
------Folder name B3
--------File name qqq.pdf >> rename this "Folder name B1.pdf"
1/ All folder and file names are unpredictable (i.e., not sequentially or otherwise pattern named)
2/ There is 1 parent folder above all (see below)
3/ Folders are always 3 deep
4/ There are never files in intermediate folders
5/ There is only 1 file in each target folder
Folder name 00
--Folder name A1
----Folder name A2
------Folder name A3
--------File name nnn.pdf >> rename this "Folder name A1.pdf"
--Folder name B1
----Folder name B2
------Folder name B3
--------File name qqq.pdf >> rename this "Folder name B1.pdf"