Insert multiple images to multiple pdf (macro)

Need some recipes of macros

I have PDF document (A_pdf) and multiple small images (A_img, B_img, C_img). How can i open PDF file A_pdf, insert images (A_img, B_img, C_img) to exact position, save PDF and close?

I found how to open PDF file:

oSys = CreateUnoService("com.sun.star.system.SystemShellExecute")
oSys.execute(sDestUrl, "", 0)

The problem is that I have a lot of PDF documents.