PDF malware analysis — malicious · dbdeaf687656b3f5

MALICIOUS

PDF

134.8 KB

MD5: f8a983045d6a126598137f8ca231af2b SHA-1: f305ec3c2ba9ea59d8c137e585f256a334988d56 SHA-256: dbdeaf687656b3f5ea73e19b0e0c03e0f73cb2a56be8070aee1bfaa6727444a7

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file exhibits multiple indicators of maliciousness, including embedded JavaScript and a critical finding of an embedded PE executable payload. The ML classifier strongly flagged this PDF as malicious. The presence of these elements suggests the document is a dropper or downloader, intended to execute the embedded PE file upon interaction, likely leading to further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 7

Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD

PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One 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.
Embedded URL info EMBEDDED_URL

One 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://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `b4308f69c6a5f62b339168e59834d6d75a1a29918b0fba50873800294b6fb5cc`	pdf-javascript-stream	PDF /JS object 12 at offset 0x1F394	14428 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`stream_000_off00000339.bin` `950e479c9042ce2443c912d7056f4ae470868b78ac0e0f05db63afc38c595583`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x339	169511 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.44, consistent with packed or encrypted content.
`embedded_pdf_0001bb50.exe` `12778d8789522527c3aec373e4ddbaec4b1f91cae27b3ef05a5043b27024f3c4`	embedded-pe	PDF decompressed stream PE payload at offset 0x1BB50	56848 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.62, consistent with packed or encrypted content.

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