MALICIOUS
228
Risk Score
Malware Insights
MITRE ATT&CK
T1059.007 Service Execution: JavaScript
T1204.002 Malicious Link: Malicious File
The PDF sample contains critical heuristic firings for XFA heap spray and embedded script payloads, indicating exploitation of XFA forms. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript, stream_000_off00000042.js, is highly likely to be involved in downloading and executing a second-stage payload, as is common with PDF droppers.
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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XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAYPDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
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ClamAV: Pdf.Dropper.Agent-5600417-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Dropper.Agent-5600417-0
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Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOADPDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
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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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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.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
stream_000_off00000042.js2d9007a835d3c6529b816ec858cb934ee6ffeae84bf9dc7b26648f4841db7f75 |
decompressed-pdf-stream | PDF FlateDecoded stream at offset 0x42 | 4194304 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 4 eval/decoder/string-building token(s).
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