Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac309ad04c753b82…

MALICIOUS

PDF

13.2 KB First seen: 2013-08-13
MD5: 8894a923ea1da5dcb1e5e3afc2a44888 SHA-1: a6bd85f0eb8645e4877c14ad3816a45f9f3056b2 SHA-256: ac309ad04c753b82a82c795bb83f3d321e3830500eb18c65305fae212bb7e5b1
70 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution

The PDF file contains an embedded script payload, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. This suggests an attempt to exploit a vulnerability within the PDF reader to execute malicious code. The embedded file, 'embedded_file_obj0008.bin', is likely the payload. The XFA form and embedded file heuristics further support the presence of complex, potentially malicious, embedded content.

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/xci/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 0xD5 12776 bytes
SHA-256: e094e8e874101f540d0dfac0776787c1cd0d0177b9b553ebb24294e3754e0b55

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