The following encrypted message has the filename field set to "-&14". This does not happen with GnuPGv2.2.17.
-----BEGIN PGP MESSAGE----- hQGMA3wvqk35PDeyAQwAirvE/UPNUWZ6mUKwSAC7Ac/0HLK4fYtSL+5KyMpWvcNM DDFwxbQEqs182NPXLSzS6wYhD/vMrvhQDOgFYHel1GUrfqLgAmeBPDjl3z2rwtkG E6P2LEfxx9Vr0Y+30kVV+McNHF6s02ogK2GOV8YN0l/RxujnDcjJzYxsrmx19u6d GTON4CaVbb9JwMUr90QiUu67JF1C3VU5YzBzHWA060I7131uC5e+K3FxCqeKXyPH 0qLKgDjRintIArLdCscOgw1F54kgF20vS6l+PFU0gi8mXqHzi5HfjO21KU33XvEr IKsci9BkNJgaJzEUMXpCA6xJ8JL75VLFfUWzgQyo7XtrcUOi5dSRAGDKpCQwYQnU GmJ8luX8DIpNtgdARsqz+mFQxX+EhuthbX59pAHk1tfhTNmxDuMI/7x7dnYH6tDV c86ndGPea4PQxP9ym8s3GtpjDS+PJGPNuNbD7n5+OG2hYiURNefaWFzBhFju4tIK ptRz989w19SsGEtaBMw50kwBBJEvP3nXcIdrOXyhDN2X7sxlVRHnq+BXaq1sNfpB Iv7zL5Mxkl4BTQXzkUEAWCy2qR9o3M9gqvVHfaF0lmI4Ug/jrg9uWqeoYtfm =AnZq -----END PGP MESSAGE-----
The message is encrypted with the 'Bob' key from draft-bre-openpgp-samples-00:
-----BEGIN PGP PRIVATE KEY BLOCK----- Comment: Bob's OpenPGP Transferable Secret Key lQVYBF2lnPIBDAC5cL9PQoQLTMuhjbYvb4Ncuuo0bfmgPRFywX53jPhoFf4Zg6mv /seOXpgecTdOcVttfzC8ycIKrt3aQTiwOG/ctaR4Bk/t6ayNFfdUNxHWk4WCKzdz /56fW2O0F23qIRd8UUJp5IIlN4RDdRCtdhVQIAuzvp2oVy/LaS2kxQoKvph/5pQ/ 5whqsyroEWDJoSV0yOb25B/iwk/pLUFoyhDG9bj0kIzDxrEqW+7Ba8nocQlecMF3 X5KMN5kp2zraLv9dlBBpWW43XktjcCZgMy20SouraVma8Je/ECwUWYUiAZxLIlMv 9CurEOtxUw6N3RdOtLmYZS9uEnn5y1UkF88o8Nku890uk6BrewFzJyLAx5wRZ4F0 qV/yq36UWQ0JB/AUGhHVPdFf6pl6eaxBwT5GXvbBUibtf8YI2og5RsgTWtXfU7eb SGXrl5ZMpbA6mbfhd0R8aPxWfmDWiIOhBufhMCvUHh1sApMKVZnvIff9/0Dca3wb vLIwa3T4CyshfT0AEQEAAQAL/RZqbJW2IqQDCnJi4Ozm++gPqBPiX1RhTWSjwxfM cJKUZfzLj414rMKm6Jh1cwwGY9jekROhB9WmwaaKT8HtcIgrZNAlYzANGRCM4TLK 3VskxfSwKKna8l+s+mZglqbAjUg3wmFuf9Tj2xcUZYmyRm1DEmcN2ZzpvRtHgX7z Wn1mAKUlSDJZSQks0zjuMNbupcpyJokdlkUg2+wBznBOTKzgMxVNC9b2g5/tMPUs hGGWmF1UH+7AHMTaS6dlmr2ZBIyogdnfUqdNg5sZwsxSNrbglKP4sqe7X61uEAIQ bD7rT3LonLbhkrj3I8wilUD8usIwt5IecoHhd9HziqZjRCc1BUBkboUEoyedbDV4 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