Some books like Acts and the third gospel are anonymous. Note that he is not one of the apostle and was not first generation of Christian. Even those bearing the name of the writer like 2 Peter and Revelation, may not be written by actual person. 2 Peter may be written in the second century. As for orthodoxy, Jude 9 and 14 quote from uncanonical Old Testament books.
Revelation claims inspiration, yet it is one of the disputed books which entered the canon later.
On the other hand, Philemon which does not claim inspiration and contains no prophecy was accepted earlier. Thus by itself, none of New Testament books cannot prove its canonicity and if we rely on the testimony of the Christians in the first and second century, they too may have different opinion on particular book. Thus we need the other and final criteria, the authority of the Church who has the final say regarding which book belongs to our Old and New Testaments. While virtually most of Christians accept the same New Testament, they have different opinion of its relation with the Church. Anti Catholic writers try to reject Church authority in defining the books of the Bible.