Text marking with this file
https://issues.apache.org/jira/secure/attachment/12769999/type3%20zero%20font%20size.pdf
has a giant size.

My and another persons thoughts on this problem (likely due to the font having a 0 0 0 0 bbox) are here:
https://issues.apache.org/jira/browse/PDFBOX-3076

t.d = { d: OPS.etDah, numArg: 2, varbleArg: fale };
      t.r = { d: OPS.etRenderngIntent, numArg: 1, varbleArg: fale };
      t. = { d: OPS.etFlatne, numArg: 1, varbleArg: fale };
      t.g = { d: OPS.etGState, numArg: 1, varbleArg: fale };
      t.q = { d: OPS.ave, numArg: 0, varbleArg: fale };
      t.Q = { d: OPS.retre, numArg: 0, varbleArg: fale };
      t.cd: OPS.tranfrm, numArg: 6, varbleArg: fale };
       Path
      t.d: OPS.mveT, numArg: 2, varbleArg: fale };
      t.l = { d: OPS.lneT, numArg: 2, varbleArg: fale };
      t.c = { d: OPS.curveT, numArg: 6, varbleArg: fale };
      t.v = { d: OPS.curveT2, numArg: 4, varbleArg: fale };
      t.y = { d: OPS.curveT3, numArg: 4, varbleArg: fale };
      t.h = { d: OPS.clePath, numArg: 0, varbleArg: fale };
      t.re = { d: OPS.rectangle, numArg: 4, varbleArg: fale };
      t.S = { d: OPS.trke, numArg: 0, varbleArg: fale };
      t. = { d: OPS.cleStrke, numArg: 0, varbleArg: fale };
      t.f = { d: OPS.fll, numArg: 0, varbleArg: fale };
      t.F = { d: OPS.fll, numArg: 0, varbleArg: fale };
      t["f*"] = { d: OPS.eFll, numArg: 0, varbleArg: fale };
      t.B = { d: OPS.fllStrke, numArg: 0, varbleArg: fale };
      t["B*"] = { d: OPS.eFllStrke, numArg: 0, varbleArg: fale };
      t.b = { d: OPS.cleFllStrke, numArg: 0, varbleArg: fale };
      t["b*"] = { d: OPS.cleEOFllStrke, numArg: 0, varbleArg: fale };
      t.n = { d: OPS.endPath, numArg: 0, varbleArg: fale };
       Clppng
      d: OPS.clp, numArg: 0, varbleArg: fale };
      t["W*"] = { d: OPS.eClp, numArg: 0, varbleArg: fale };
       Text
      t. d: OPS.begnText, numArg: 0, varbleArg: fale };