PDFBOX-5906: ignore isolated +

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1921994 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/pdfparser/PDFStreamParser.java

@@ -222,7 +222,14 @@ else if( next.equals( "false" ) )
                         dotNotRead = false;
                     }
                 }
-                return COSNumber.get(buf.toString());
+                String s = buf.toString();
+                if ("+".equals(s))
+                {
+                    // PDFBOX-5906
+                    LOG.warn("isolated '+' is ignored");
+                    return COSNull.NULL;
+                }
+                return COSNumber.get(s);
             case 'B':
                 String nextOperator = readString();
                 Operator beginImageOP = Operator.getOperator(nextOperator);