[gdal-dev] ERROR 6: Failed to initialize PROJ.4 during warp

[Gane R]

gdalinfo for a file is as

Driver: PDF/Geospatial PDF
Files: C:\la plata_final_sept8-1.pdf
Size is 5100, 3300
Coordinate System is:
PROJCS["unnamed",
    GEOGCS["unknown",
        DATUM["WGS_1984 based datum",
            SPHEROID["Sphere",6378137,0],
            TOWGS84[0,0,0,0,0,0,0]],
        PRIMEM["Greenwich",0],
        UNIT["degree",0.0174532925199433]],
    PROJECTION["Mercator_1SP"],
    PARAMETER["central_meridian",0],
    PARAMETER["scale_factor",0],
    PARAMETER["false_easting",0],
    PARAMETER["false_northing",0],
    UNIT["Meter",1]]
PROJ.4 string is:
'+proj=merc +lon_0=0 +k=0 +x_0=0 +y_0=0 +a=6378137 +b=6378137
+towgs84=0,0,0,0,0,0,0 +units=m +no_defs '
Origin = (-8569762.871896760500000,4652059.044867600300000)
Pixel Size = (0.467090635994096,-0.467090635994096)
Metadata:
  CREATION_DATE=D:20160908221821-04'00'
  CREATOR=Esri ArcMap 10.3.1.4959
  NEATLINE=POLYGON ((-8567450.7732485905
4650589.7565349042,-8569692.8083013594
4650589.7565349042,-8569692.8083013594 4
651991.0284428885,-8567450.7732485905
4651991.0284428885,-8567450.7732485905 4650589.7565349042))
  PRODUCER=TerraGo Technologies Publisher for ArcGIS GeoPDF Export version:
7.0.0.43
Corner Coordinates:
Upper Left  (-8569762.872, 4652059.045)
Lower Left  (-8569762.872, 4650517.646)
Upper Right (-8567380.710, 4652059.045)
Lower Right (-8567380.710, 4650517.646)
Center      (-8568571.791, 4651288.345)
Band 1 Block=5100x1 Type=Byte, ColorInterp=Red
Band 2 Block=5100x1 Type=Byte, ColorInterp=Green
Band 3 Block=5100x1 Type=Byte, ColorInterp=Blue

when I try to do a gdalwarp to EPSG:3857  for the above file I get the
following  '.

ERROR 6: Failed to initialize PROJ.4 with `+proj=merc +lon_0=0 +k=0 +x_0=0
+y_0=0 +a=6378137 +b=6378137 +towgs84=0,0,0,0
,0,0,0 +units=m +no_defs. k <= 0

any suggestions ??
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