Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7418412d008d97…

MALICIOUS

PDF

69.7 KB First seen: 2026-05-09
MD5: f0400b1eabf5db04e9ede175a14c39a4 SHA-1: 3ecd383b0dbc156890039d8011d4b1ded10cde10 SHA-256: 7f7418412d008d975d1bdc99da645b9979c53f705012ae2e3beef58cbbdf6d54
212 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains a malformed stream and uses unescape() calls, indicating an attempt to exploit a vulnerability. The presence of XFA forms with executable scripts and an embedded file further supports malicious intent. ClamAV detection confirms this as Pdf.Malware.Agent-9820277-0, likely a downloader or exploit loader.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 9

  • 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.
  • ClamAV: Pdf.Malware.Agent-8008613-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Malware.Agent-8008613-0
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
    Matched line in script
    r=a[20]+b[28]+c[28]+b[20]+c[29]+c[5]+c[20]+d[28]+c[16]+b[20]+a[28]+d[14]+a[20]+c[29]+c[24]+a[20]+b[28]+d[27]+d[20]+b[28]+d[19]+c[20]+d[28]+a[16]+a[20]+a[26]+d[23]+c[20]+a[28]+c[12]+c[20]+d[28]+c[14]+a[20]+a[29]+a[26]+b[20]+b[28]+d[24]+d[20]+c[28]+c[5]+b[20]+b[26]+a[18]+d[20]+a[26]+b[27]+c[20]+d[29]+c[15]+a[20]+b[29]+b[28]+d[20]+a[28]+a[12]+c[20]+c[29]+d[26]+a[20]+d[26]+c[23]+b[20]+c[29]+b[23]+b[20]+d[28]+c[19]+d[20]+b[28]+d[11]+b[20]+c[28]+a[18]+a[20]+a[14]+d[8]+b[20]+c[28]+c[12]+c[20]+b[29]+c[2 …
e(unescape(r));
</script>
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 info 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/ In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.5/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 70628 bytes
SHA-256: 4df5707ceb489f1235c7a18e75890766bd06bbf3a2d1d448dc0fa50fdc79df23
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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