Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c70ab70aef4619…

MALICIOUS

PDF

70.3 KB
MD5: a6422c8c42b221f4b0defffa5b790d0f SHA-1: 9357d6d979ee96c2359da9417d1e7aeeb429dd4f SHA-256: 24c70ab70aef4619dc684a6532fbe2cc001fedc99ea87632b18383195fe8bcd9
148 Risk Score

Malware Insights

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

The PDF sample contains embedded script content and triggers heuristics related to XFA forms and unescape() calls, indicating an attempt to execute malicious code. The ML classifier strongly flags this as malicious. The embedded file artifact suggests a potential second-stage payload delivery. The primary attack vector appears to be exploiting PDF vulnerabilities to run arbitrary code.

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
16871380b5d5bb9eeab0e85866b7ec30c87a41210d37206eb8b73d1c6d294d7d		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 71270 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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