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HTPBE?

Structural PDF tamper detection API. Catches edits your KYC stack misses.

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Status

Algorithm v2.23.1

Tool profile

VCTransaction

VCTransaction appears on both legitimate first-generation output and downstream re-save flows — context (the other tool on the same document) is what flips the signal.

Back to all statistics
Forensic verdict

Mixed signal

Based on 34 appearances across the HTPBE? corpus.

Modification rate
65%+17pp above baseline
Corpus baseline: 48%
Total appearances
34
0.16% of corpus
Modification rate
65%
+17pp above baseline
Role split
100%C/0%P
Creator vs Producer share of appearances

Corpus profile

How VCTransaction shows up in HTPBE? corpus

VCTransaction is one of the PDF-handling tools surfaced in the HTPBE? corpus. VCTransaction appears predominantly as the original Creator (100% of its occurrences) — i.e. on documents that started life inside VCTransaction rather than passing through it as a downstream re-saver.

In the HTPBE? corpus the contextual signal we look for is a producer/creator mismatch: when VCTransaction appears as the latest Producer on a document whose Creator was an institutional source (e.g. Adobe PDF Library, Microsoft Word, a banking back-end), the document was rebuilt or re-saved after its original creation. That mismatch is the marker — never the tool itself.

On documents where VCTransaction acts as Creator, 65% carry modification markers; on documents where it acts as Producer, 0% do. These are observed rates inside the HTPBE? corpus and should be read as base-rates, not as accusations against VCTransaction or its users.

The signal
In the HTPBE? corpus the contextual signal we look for is a producer/creator mismatch: when VCTransaction appears as the latest Producer on a document whose Creator was an institutional source (e.g. Adobe PDF Library, Microsoft Word, a banking back-end), the document was rebuilt or re-saved after its original creation. That mismatch is the marker — never the tool itself.

Role in the workflow

How VCTransaction shows up in metadata

Every PDF carries a Creator (the application that produced the original document) and a Producer (the engine that wrote the PDF). The same tool can appear in either slot, with very different modification profiles.

CAs Creator · 100%
As Producer · 0%P
CAs Creator
  • Usage
    34
  • Modification rate
    65%
  • Avg file size
    3.5 MB
PAs Producer
  • Usage
    0
  • Modification rate
    0%

How to read this

The Creator slot typically reflects where a document started life. The Producer slot reflects whatever wrote the bytes — and is the field that gets overwritten when a PDF is opened, edited, and saved by a downstream tool.

A higher modification rate as Producer than as Creator usually means the tool is acting as a re-saver on documents that originated elsewhere. A higher rate as Creator points to fragile workflows around the original authoring app.

Distributions

What ships alongside VCTransaction

The PDF versions VCTransaction writes when acting as Producer, and the other tools that appear in the same documents.

Common Producers when VCTransaction is the Creator

PDFlib writes 97% of these files — that pairing is the Adobe-stack default for many institutional pipelines.

PDFlib97.1%
pdf-lib2.9%

Related profiles

Tools you’ll see next to VCTransaction

Other tools that frequently share metadata with VCTransaction in the same documents. Each card links to its own forensic profile.

P97% co-occurrence
PDFlib
Appearances287
Mod rate10%
P3% co-occurrence
pdf-lib
Appearances74
Mod rate85%

Long tail

Notable observations

Smaller cuts of the VCTransaction corpus — useful context, but treat each row as a single data point rather than a strong signal.

Pages parsed
109
Oldest observed
1 Jan 2026 — 5 months ago

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