Forensic check

HTPBE_MIXED_TOOLING_CLASSES

Q: What does HTPBE_MIXED_TOOLING_CLASSES mean?

HTPBE_MIXED_TOOLING_CLASSES is a named finding in an HTPBE result: pages that went through different production routes in one document. It is returned in the modification_markers list of a modified result and belongs to the Document Assembly group of checks.

HTPBE_MIXED_TOOLING_CLASSES appears on 2.5% of modified results in our corpus. A marker is evidence about the file, not a judgement about the person who sent it.

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Marker profile

Document Assembly

Pages that went through different production routes in one document.

Share of modified results

2.5%

Frequency rank

#13

Among the 56 markers seen in modified results

Certain confidence

3.1%

Of results with this marker rated certain rather than high

Fires alone

Results where it is the only marker found

Marker profile

What HTPBE_MIXED_TOOLING_CLASSES tells you

HTPBE_MIXED_TOOLING_CLASSES is one of the named findings returned in modification_markers when a PDF is reported as modified. It belongs to the Document Assembly group of checks. These checks look at whether a document reads as one coherent production or as pages and parts brought together from several places.

On 0% of the modified results that carry HTPBE_MIXED_TOOLING_CLASSES it is the only marker. A result with this marker carries 4.9 markers on average. It is most often found together with HTPBE_MULTIPLE_REVISION_LAYERS, on 98.1% of these results.

Example API response

How it appears in a result

When a PDF is reported as modified, HTPBE_MIXED_TOOLING_CLASSES is listed in modification_markers next to the verdict and its confidence. Each marker is a named, actionable finding – not a score.

GET /api/v1/result/{id}

{
  "id": "9f3a2c1d-8b47-4e6f-a012-3d5e7f890123",
  "status": "modified",
  "modification_confidence": "high",
  "modification_markers": [
    "HTPBE_MIXED_TOOLING_CLASSES"
  ],
  "creator": "Adobe Acrobat Pro DC",
  "has_incremental_updates": true,
  "page_count": 3
}

Full schema in the API reference →

Distributions

What ships alongside HTPBE_MIXED_TOOLING_CLASSES

The tools, formats and document traits that appear on the modified results carrying this marker. Shares are of those results.

Common Producers

Skia/PDF writes 2.3% of these results – and 4.6% of all modified results naming it carry this marker.

Skia/PDF4.6% of its modified2.3%

iOS Print to PDF1.0% of its modified1.1%

Common Creators

Chrome (Print to PDF) is the Creator on 1.1% of these results.

Chrome (Print to PDF)2.7% of its modified1.1%

Often found together with

HTPBE_MULTIPLE_REVISION_LAYERS sits next to HTPBE_MIXED_TOOLING_CLASSES more often than any other marker.

HTPBE_MULTIPLE_REVISION_LAYERS98.1%

HTPBE_METADATA_ONLY_REVISION95.8%

HTPBE_EDITING_TOOL_FINGERPRINT95.4%

HTPBE_IDENTITY_BLANKED95.4%

HTPBE_DATES_DISAGREE2.7%

HTPBE_MIXED_PAGE_DIMENSIONS1.9%

HTPBE_DESIGN_TEMPLATE_ASSEMBLY1.5%

Document origin

Unknown95.4%

Consumer software3.8%

Creator → Producer pairs

Chrome (Print to PDF) → Skia/PDF1.1%

Detected origin software

Google Workspace2.3%

macOS / iOS (Quartz)1.5%

Confidence of the verdict

Certain3.1%

High96.9%

When these results were checked

April 202696.9%

May 20261.1%

June 20260.8%

October 20261.1%

Document length

2–5 pages3.4%

6–20 pages96.2%

21–100 pages0.4%

File size

100 KB – 1 MB99.6%

Over 5 MB0.4%

PDF versions

PDF 1.796.2%

PDF 1.31.5%

PDF 1.41.1%

PDF 1.61.1%

Year the document says it was created

20264.6%

Long tail

Notable observations

Smaller cuts of the results carrying HTPBE_MIXED_TOOLING_CLASSES – useful context, but treat each row as a single data point rather than a strong signal.

Digitally signed

1.1%

Of files carry at least one digital signature

Saved revisions

99.2%

Of files contain earlier saved revisions

Embedded JavaScript

Of files contain JavaScript code

Embedded files

Of files have attachments inside

Avg pages per document

14.7

Markers per result

4.9

Average number of markers on these results

Related checks

HTPBE_MIXED_TOOLING_CLASSES: common questions

What does HTPBE_MIXED_TOOLING_CLASSES mean?

HTPBE_MIXED_TOOLING_CLASSES is a named finding in an HTPBE? result: pages that went through different production routes in one document. It is returned in the modification_markers list of a modified result and belongs to the Document Assembly group of checks.

Does HTPBE_MIXED_TOOLING_CLASSES mean the document is fake?

No. A marker is evidence about the file, not a judgement about the person who sent it. It records that the file shows this pattern; it does not say why, and it does not assess what the document states. Read it together with the verdict and any other markers on the same result.

What should I do when a result contains HTPBE_MIXED_TOOLING_CLASSES?

Ask the sender for the original file straight from the issuing system, or request a fresh copy from the issuer. Check whether the document went through a later step such as re-saving, merging or converting, and verify it with the issuer before relying on it for a decision.

How common is HTPBE_MIXED_TOOLING_CLASSES?

HTPBE_MIXED_TOOLING_CLASSES appears on 2.5% of the modified results in the HTPBE? corpus. The corpus consists of PDFs people chose to submit for checking, so it skews towards documents someone had a reason to doubt and is not a sample of all PDFs.

Where do I see HTPBE_MIXED_TOOLING_CLASSES?

In the modification_markers list of the result returned by the HTPBE? API, and on the result page of a modified document. Other checks in the Document Assembly group are listed below on this page; all 63 checks are listed on the how-it-works page.

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