Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed636b16d05a5b64…

MALICIOUS

PDF

69.1 KB
MD5: afd22386ed30233f4041777a2a208bd7 SHA-1: 7dd782dfce5c16f630ad176adc0e00821802ee75 SHA-256: ed636b16d05a5b64f6282d3d5e1e790802b987f7c47768e16b2ebd411ee280b9
148 Risk Score

Malware Insights

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

The PDF sample contains embedded script content and triggers heuristics related to XFA forms and unescape() calls, indicating an attempt to execute malicious code. The ML classifier strongly flags this PDF as malicious. While no specific family is identified, the presence of embedded scripts and the use of unescape() suggest the document is designed to download and execute a second-stage payload. The embedded file artifact further supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF 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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
4886563a3d37e61f10c79a1c6a95cdfade0638f5add715725e6194fa9e6886d4		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 70044 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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