Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc7bfa21a36c2e9…

MALICIOUS

PDF

35.5 KB First seen: 2013-07-12
MD5: 5999b131fee983704554b05a3937d61c SHA-1: 7ed0b98ee4f7fbacc7281662373b6ae44c72c907 SHA-256: 5cc7bfa21a36c2e9f33450d4e6d09847be30898b621e67ca33a34dccc2fb6e4c
70 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF exhibits multiple indicators of maliciousness, including malformed streams and embedded script payloads, strongly suggesting exploitation. The ML classifier output of 0.999991 further supports this assessment. While specific URLs are benign, the overall structure and heuristics point towards an exploit delivery mechanism, likely via spearphishing.

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 35666 bytes
SHA-256: 1e92758b9b71f69cb177bcfc595baa7e84c218bb0c90d8ae931d2062bc8bd866

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