Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa3b84409766796…

MALICIOUS

PDF

104.7 KB
MD5: 230cc7dd8a0bf28e1d19312684a12b14 SHA-1: 6a8904ed989c4e4e4e8b66305ac48d500e19ffdc SHA-256: 5fa3b84409766796c709511f4509c9434f500c9c105c837f3b675a1c95f8d901
158 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains XFA forms and embedded scripts, indicated by multiple high-severity heuristics including PDF_XFA_SCRIPT and PDF_UNESCAPE. The ML classifier strongly flagged this PDF as malicious. While no external URLs were found to be malicious, an embedded file artifact was extracted, suggesting a potential payload delivery mechanism. The presence of XFA and script execution points towards an attack pattern commonly used for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 8

  • 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 (matched inside decoded stream)
  • 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
  • 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
  • Embedded script payload in PDF stream low 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.
  • 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
06a5a01e1e08c37547607b92e7369aa8b4762691a3feacf85cd0d41a7ef1cbf6		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xE2 15202 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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