Malicious PDF — malware analysis report

Static analysis result for SHA-256 303ffed9e0bc2b6f…

MALICIOUS

PDF

16.6 KB
MD5: 18e15053b6059196c4df923aca14b6cc SHA-1: 3e7ccb8150ba0041a8d4afa0179bacfccf5e98bd SHA-256: 303ffed9e0bc2b6fc869612d984ebe031bbd52acb68fd72227f1fee8f766eae7
148 Risk Score

Malware Insights

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

This PDF document exhibits multiple high-severity heuristic firings indicating malicious intent, including the presence of XFA forms with risky executable scripts and an embedded file. The ML classifier strongly flags this as malicious. The embedded file, 'embedded_file_obj0008.bin', is likely a secondary payload. The document body content is minimal and does not provide further clues on the specific lure.

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
991351bb27d28102ea0fd9192b67849a27827561e5b869298088c4c0516c3c0e		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 16241 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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