Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fde56e82d707ecf…

MALICIOUS

PDF

63.9 KB
MD5: 822a0c0a1124f1da510c4e799704d402 SHA-1: 8ba823c1821cc725d3cf01de8f7cf08678e105e8 SHA-256: 8fde56e82d707ecff79a647e00010779d659d0f2eae67d19f4e73a92ef0f7cca
118 Risk Score

Malware Insights

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

The PDF file contains embedded XFA forms and uses an unescape() call, indicating an attempt to obfuscate malicious JavaScript. The heuristics suggest this script is a payload designed to exploit a PDF viewer vulnerability. An embedded file, 'embedded_file_obj0008.bin', was also extracted, which is likely the secondary payload. The exact intent of the script is not fully discernible due to obfuscation, but it is highly probable that it aims to download and execute further malicious content.

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
2aa08551371cb585fb890a46d0a642e6c49e4a6f8d162fe5e77d360fef5b2e6d		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 64664 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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