printableArea

Scale pages to fit the printable area.
[read/write property] printableArea([out, retval] VARIANT_BOOL *printable) printableArea([in] VARIANT_BOOL printable)
Most printers cannot print all the way to the edges of the paper. If this property is set to true, pages will be scaled to fit into the printable area of the paper, as defined by the printer driver.

resetParams resets this to its default value of false, which means to use the entire paper size. Page content outside the printable area (i.e., too close to the edges) will not be printed.

VB6:
pdf.printableArea = True
resetParams