Malicious PDF — malware analysis report

Static analysis result for SHA-256 876192e38095ad9f…

MALICIOUS

PDF

70.4 KB
MD5: 1b9581006ac456283aec205291c1e6b3 SHA-1: 48ef1d8f7286f89a0a274fc9f1ac2aa4857f4e3f SHA-256: 876192e38095ad9ff62ef23c0fa018381c33787f0d6bd4de3caef76b27413f69
148 Risk Score

Malware Insights

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

The PDF contains XFA forms and embedded scripts, indicated by the PDF_XFA and PDF_XFA_SCRIPT heuristics. The PDF_UNESCAPE heuristic suggests obfuscation is used to hide malicious code. The ML classifier strongly flags this as malicious. The embedded script likely downloads and executes a second-stage payload, although the exact mechanism is obscured. The presence of an embedded file further supports a multi-stage attack.

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
b53c20cb27470a4cca19795813d25c92e95d8a985e20452ce4c564b3a537ca41		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 71404 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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