Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99bc704789b04bf…

MALICIOUS

PDF

69.4 KB
MD5: 4a72f828963a57d8b1b2dc3cf5070c33 SHA-1: f5ab6b29201596178d38dbd8a754d193cf4bc117 SHA-256: a99bc704789b04bf8f0bdebc99a6deadbc7e790bbed3338d4e4822d384523870
118 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.007 JavaScript

The PDF sample contains embedded content and XFA forms, which are often used to deliver exploits. The presence of PDF_UNESCAPE and PDF_XFA_SCRIPT heuristics indicates the use of potentially malicious JavaScript within the XFA form. This script likely attempts to exploit a vulnerability or download a secondary payload, as suggested by the embedded file artifact. The exact script functionality is obscured, leading to a moderate confidence level.

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
f945adcd3fb10cd2a0174a2c16286f7a6f78e37a125364631c760f155fd7f054		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 70324 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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