Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3bd391af6f38d3…

MALICIOUS

PDF

68.1 KB
MD5: bbf3c8245259d55e858bf607b4a8dd3f SHA-1: 535bd28ed6027a199d59271b71bae00b102b2b6e SHA-256: 3b3bd391af6f38d3cff1c0b6460241a5bf9ab96e7a3b946e0995708345684a32
148 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Attachment T1059.007 Abuse Execution: JavaScript T1566.002 Phishing: Spearphishing Attachment

This PDF file exhibits malicious characteristics, including the presence of XFA forms and embedded scripts, which are often used to exploit vulnerabilities or deliver further malware. The 'PDF_UNESCAPE' and 'PDF_XFA_SCRIPT' heuristics indicate the use of potentially dangerous scripting techniques within the XFA form. The ML classifier strongly flags this PDF as malicious. The embedded file suggests a secondary payload delivery mechanism. The overall confidence is high, but the specific family remains undetermined due to the lack of more specific indicators.

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
beda1410a437cf8a930dd9ac1e51836be83cf39177ea7e056800595de4371df5		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 69009 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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