Unsupported PDF version

I have HP laserjet 4350 network printer.

I´m getting error message:

"PDF Warning Page

Warning Number: 12.001

Warning Type: Unsupported PDF Version

Warning Description: Version Not Supported: PDF-1.7

PDF Operator: Unknown Operator

Warning Message: File may not have printed correctly"

Where can I check if our printer is able to print this kind of PDF version.

I have updated newest HP PS driver to the server (2008 R2) and updated printer firmware.

Printer configuration says that PostScript in enabled.

I have upgrade printer memory, total 336Mb

Any suggestions how to proceed.