All specifications (from 1.3 to 2.0) state that
"The keyword stream that follows the stream dictionary shall be followed by an end-of-line marker consisting of either a CARRIAGE RETURN and a LINE FEED or just a LINE FEED, and not by a CARRIAGE RETURN alone." (section 7.3.8.1 of the spec v. 2.0)
But JHOVE (v. 1.34.0, PDF-hul 1.12.8) does not check that and reports a file that would have single carriage returns following 'stream' as well-formed and valid.