Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce191c12366b550…

MALICIOUS

PDF

300.1 KB
MD5: e9144be25f60b1437942a12227cf88bd SHA-1: 6f665a6a417745e9067f28be188cbea105d69ed9 SHA-256: cce191c12366b5509fb90847e56de58763da00e55d8672743632d08959d7d19e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by ML classifiers and ClamAV due to its obfuscated nature and the presence of embedded JavaScript and a PE executable payload. The embedded JavaScript, named 'javascript_obj0012_000.js', is likely responsible for downloading and executing the second-stage payload, which is the embedded PE file 'embedded_pdf_0002ce55.exe'. The XFA form structure also indicates a potential for exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9324

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.
  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.

FilenameKindSourceSize
javascript_obj0012_000.js
e6af96af0cad4fe39fc7128986ff07f04b2a42708ac85beed23a1e6abba6c814		 pdf-javascript-stream PDF /JS object 12 at offset 0x4A36D 3517 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
stream_000_off00000447.bin
3d68b6c65f2aff682ee36830025e4b0bbc1d6190719567586d71e5b17223b3fc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x447 525856 bytes
embedded_pdf_0002ce55.exe
134290aa3b149f9e74c1f654ec13eb88ed554418fb8a3698b7f05058966f4d61		 embedded-pe PDF decompressed stream PE payload at offset 0x2CE55 343058 bytes

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