PDF malware analysis — malicious · 4ae4321ced99e87d

MALICIOUS

PDF

509.7 KB

MD5: cc63277702e6135f9822d14878a12f0c SHA-1: f964761bd9eac8bf420cfa42276249c357dfc199 SHA-256: 4ae4321ced99e87db8b875914912a01b62b1782f85b188ac88bd08b474ab0101

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF contains embedded JavaScript and an embedded PE executable payload. The JavaScript action and embedded JS stream heuristics indicate that the script is likely responsible for downloading and executing the embedded executable. The ML classifier strongly flags this PDF as malicious. The embedded executable is the primary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9988

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 0x7CF0E	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` `2bc4a2f7a31fd17076e81e00f492811e6160ad4805ad7053e486d6fd1487cc90`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x339	575509 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.
`embedded_pdf_0008833e.exe` `97dbbbad3e78480bc20a56b5328d0006599f3394e1c903d3198083b8a51cd02f`	embedded-pe	PDF decompressed stream PE payload at offset 0x8833E	18448 bytes

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