MALICIOUS
104
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1204.002 Malicious File
The PDF contains a high-severity heuristic firing for XFA form with risky executable script, indicating the document is designed to exploit this functionality. The ML classifier also flagged it with high confidence. The presence of multiple embedded files, one of which is flagged as a suspicious extracted artifact with script obfuscation indicators, further supports a malicious intent. The script likely downloads and executes a second-stage payload, though its exact nature is obscured.
Machine Learning
- Nyx PDF Classifier malicious score 0.9995
Heuristics 7
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XFA form contains risky executable script high PDF_XFA_SCRIPTPDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
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Embedded file low PDF_EMBEDDEDPDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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XFA form low PDF_XFAPDF uses XML Forms Architecture — can contain script logic
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String.fromCharCode low PDF_FROMCHARCODEString.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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AcroForm button with action trigger low PDF_ACROFORM_BUTTONPDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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Embedded URL info EMBEDDED_URLOne or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.URL http://www.xfa.org/schema/xfa-locale-set/2.1/
Extracted artifacts 6
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
embedded_file_obj0041.binc06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb |
pdf-embedded-file | PDF EmbeddedFile object 41 at offset 0x39EE | 85 bytes |
embedded_file_obj0042.binb40a217a8d9b8d3671cc3874c550d30941b93ca6dde99995d43921dede579865 |
pdf-embedded-file | PDF EmbeddedFile object 42 at offset 0x3AA0 | 1183 bytes |
embedded_file_obj0043.bin7603a3f3555a44eccaa71e4b2011b76cd9a84809b906d7f87e085ee82c67299d |
pdf-embedded-file | PDF EmbeddedFile object 43 at offset 0x3CF0 | 1719 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 1 eval/decoder/string-building token(s).
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embedded_file_obj0044.bin3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169 |
pdf-embedded-file | PDF EmbeddedFile object 44 at offset 0x40C6 | 144 bytes |
embedded_file_obj0045.bin10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275 |
pdf-embedded-file | PDF EmbeddedFile object 45 at offset 0x4172 | 77 bytes |
font_00_cff_off00004286.bin062eede2d0cc5d3972869dc7e2f2f9f01d1d1b3756b715c8252f06948ce99ae2 |
pdf-font-stream | PDF embedded font (cff) at offset 0x4286 | 1192 bytes |
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