Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3851e6f5f488b1…

MALICIOUS

PDF

66.1 KB
MD5: dbbb97324afb4e7bbfd36002e1d2b2a9 SHA-1: 1b68ed66555fb35dc9b12650a5b78efc3d029584 SHA-256: fc3851e6f5f488b1249e69dfc769c7c7383d24e48f66f5bd4960dcc3b0f1e298
148 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF contains embedded content and triggers heuristics for XFA forms with risky executable scripts and unescape() calls, indicating an attempt to exploit vulnerabilities. The ML classifier strongly flags this PDF as malicious. An embedded file named 'embedded_file_obj0008.bin' was extracted, suggesting it is the primary payload.

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
33dc72574a36503d80e8562a00403758c7197bb69fc6ef800c595e90fc525a4d		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 66917 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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