Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ac0a215f8bdf7b…

MALICIOUS

PDF

25.8 KB
MD5: a1186ddc6c0f069d62ad72bdf5f4f58b SHA-1: 070e204bc22aaa7afc7422f2239a09e754afeca4 SHA-256: a7ac0a215f8bdf7bf05132b38ae654b5e9d9421377dea592c0c13fbbec730468
156 Risk Score

Malware Insights

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

This PDF document exhibits multiple high-severity heuristic firings indicating malicious intent, including the presence of XFA forms with risky executable scripts and embedded files. The ML classifier strongly flags this as malicious. The embedded script, although partially obfuscated, likely attempts to exploit a vulnerability and download a secondary payload, as suggested by the 'unescape()' and 'String.fromCharCode()' calls. The embedded file 'embedded_file_obj0008.bin' is also a strong indicator of malicious activity.

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
  • 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
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
  • 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
d19a280b994c0c19b8943a8d918ea522eb6e97a627b1f8f80a9d81d0a184e645		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 25690 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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