To split pages using PL/SQL, you have to use PL/PDF-Toolkit. This software is not free, but you can download and install the trial version. Check the following link:

Download PL/PDF Toolkit

After installing, you can use the following code to split pages from PDF:

Declare
  n_TotalPages number;
  b_pdf blob;
  b_Blob blob;
Begin
  Select myPdf into b_pdf from blob_tbl;

  n_Totalpages := Plpdf_Tk.Plpdf_Toolkit.Getnumberofpages(b_Pdf);
  for i in 1..n_TotalPages loop
     Dbms_Lob.Createtemporary(Lob_Loc => b_Blob,
       Cache => TRUE,
       Dur => Dbms_Lob.Call);
     b_Blob := Plpdf_Tk.Plpdf_Toolkit.Extractpages(b_Pdf,
       i,
       1);
     -- now you can store b_Blob (having 1 page) to any table
  end loop;
End;

The above PL/SQL program will loop through all your 250 pages and will extract one by one.