MALICIOUS
106
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1204.002 Malicious File
The PDF sample contains XFA forms with risky executable scripts, as indicated by the PDF_XFA_SCRIPT heuristic. The ML classifier also strongly flagged this as malicious. The embedded scripts likely aim to download and execute a second-stage payload, leveraging the XFA form's scripting capabilities. The presence of embedded files further suggests a multi-stage attack.
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 0x39D5 | 85 bytes |
embedded_file_obj0042.binb40a217a8d9b8d3671cc3874c550d30941b93ca6dde99995d43921dede579865 |
pdf-embedded-file | PDF EmbeddedFile object 42 at offset 0x3A87 | 1183 bytes |
embedded_file_obj0043.bin9ff513425aaeb16077bb80572e1b83504c71e9a5ef8505842c483f8300ce61db |
pdf-embedded-file | PDF EmbeddedFile object 43 at offset 0x3CD7 | 1739 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 0x40B5 | 144 bytes |
embedded_file_obj0045.bin10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275 |
pdf-embedded-file | PDF EmbeddedFile object 45 at offset 0x4161 | 77 bytes |
font_00_cff_off00004275.bin062eede2d0cc5d3972869dc7e2f2f9f01d1d1b3756b715c8252f06948ce99ae2 |
pdf-font-stream | PDF embedded font (cff) at offset 0x4275 | 1192 bytes |
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