>> ... we would like to know the type of encoding used in this PCL file.
>> ... How can we get it? Is it using the EBCDIC encoding?
There is no text encoding, as such.
The text (which appears to be the contents page of the "PCL5 Comparison Guide" manual) has been converted (by your reader application and the printer driver) into a raster (bitmap) image.
The generated print file contains a few initialisation sequences, then (as I stated before) the bulk of the file is a PCL-format equivalent of a Windows raster image (in this case, the compression method selected is TIFF).
The analysis was produced using the PRN File Analyse tool in the PCL Paraphernalia application, available via http://www.pclparaphernalia.eu