Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c24d38bcd276dae…

MALICIOUS

PDF

35.4 KB First seen: 2013-08-13
MD5: 52f3abfb52eb947143cbcc4490c177eb SHA-1: bc53c135b4205e36b3a1dd0a74a0e65df7be547d SHA-256: 6c24d38bcd276daeb7328b6413eea7ee5a97b1856618caf38770ff778b11a364
70 Risk Score

Malware Insights

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

The PDF contains malformed active content streams and embedded script payloads, strongly indicating an exploit attempt. The ML classifier also flagged this PDF with high confidence. While benign URLs related to Adobe and XFA were extracted, the presence of malformed streams and embedded scripts points towards exploitation for client execution, likely involving JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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 35574 bytes
SHA-256: 153654a48fcd7d8b42485d7643ac4ec7b163176434d39674270a20fe1f453baa

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