Docling Produces Unreadable Text Output for PDFs

Note: issue here is similar to #185

### Bug
I am trying to convert several PDFs of academic papers, books, etc.
For some PDFs, docling produces gibberish in converting them to markdown. You find two samples [here](http://johanneshimmelreich.net/samples.zip)

Short of the conversation working successfully, is there a way to identify PDFs that are problematic? This would allow me to skip them, set them aside, or do a `OcrOptions.force_full_page_ocr` if that helps.

### Steps to reproduce
Using the example code from GitHub

```python
from docling.document_converter import DocumentConverter

source = "one.pdf" # document per local path or URL
converter = DocumentConverter()
result = converter.convert(source)
print(result.document.export_to_markdown())
```

for one.pdf the output looks like this
`GLYPH<28>GLYPH<27>GLYPH<26> GLYPH<25>GLYPH<24>GLYPH<28>GLYPH<23>GLYPH<22>GLYPH<21>GLYPH<20> GLYPH<25>GLYPH<19>GLYPH<20> `

for two.pdf the output looks like this
`2-8[ 5O@QQ[=LLGQ[J<Z[=@[MTO>D<Q@?[<R[QM@>F<H[NT<KRERZ[?FQ>LTKRQ[BLP[=TQEK@QQ[LO[Q<I@Q[ MOLJLRELK<I[ TQ@glyph<c=19,font=/AAAAAH+Fd3270>[ *LP[ FKBLOJ<RELKglyph<c=9,font=/AAAAAH+Fd3270>[ MH@<Q@[ @J<EH[ QM@>E<I;Q<H@Q%JERMO@QQglyph<c=21,font=/AAAAAH+Fd3270>JERglyph<c=19,font=/AAAAAH+Fd3270>@?T[ LO[ XOER@[ RL[ 7M@>F<H[ 7<H@Q[ )@M<PRJ@KRglyph<c=9,font=/AAAAAH+Fd3270>[ 8D@[ 2-8[ 5O@QQglyph<c=9,font=/AAAAAH+Fd3270>[ glyph<c=29,font=/AAAAAH+Fd3270>glyph<c=29,font=/AAAAAH+Fd3270>[ ,<ZX<O?[ 7RO@@Rglyph<c=8,font=/AAAAAH+Fd3270>[ (<J=PF?C@glyph<c=10,font=/AAAAAH+Fd3270>[ 2&[glyph<c=23,font=/AAAAAH+Fd3270>glyph<c=26,font=/AAAAAH+Fd3270>glyph<c=24,font=/AAAAAH+Fd3270>glyph<c=28,font=/AAAAAH+Fd3270>glyph<c=26,font=/AAAAAH+Fd3270>glyph<c=22,font=/AAAAAH+Fd3270>[
`

### Docling version

Docling version: 2.20.0
Docling Core version: 2.17.2
Docling IBM Models version: 3.3.1
Docling Parse version: 3.3.0
Python: cpython-313 (3.13.1)
Platform: macOS-15.3.1-arm64-arm-64bit-Mach-O

### Python version
Python 3.13.1