Malicious PDF — malware analysis report

Static analysis result for SHA-256 2699bbc099ff9ffd…

MALICIOUS

PDF

69.3 KB
MD5: 1ca0707601811369458e6acfecc98ea8 SHA-1: 05b4d58ca9aad0e1039b1bdc025e467596f4ec37 SHA-256: 2699bbc099ff9ffd5e215eb554443b03d5e24cd46541437ef1c2450f9cbbd1ee
148 Risk Score

Malware Insights

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

This PDF document contains an embedded script payload within an XFA form, indicated by multiple high-severity heuristics. The script utilizes an unescape function, suggesting obfuscation. The primary attack vector appears to be the execution of this embedded script, which likely leads to the download or execution of a secondary payload, as evidenced by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'EXTRACTED_FILE_STATIC_TRIAGE' firings. The embedded file 'embedded_file_obj0008.bin' is also a key artifact.

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
cd60ec86e63bb065103fc9fc0d264f3eda34b1ae88bbfdba251d681c2ced7ebb		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 70225 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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