Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a14564629e5951e…

MALICIOUS

PDF

12.1 KB First seen: 2015-10-13
MD5: f0284b128b1957d75908bdb8b3db96b0 SHA-1: fe69e2ef9361cc7b8d19a31a2b35e8f04d1e7b96 SHA-256: 3a14564629e5951eb7eda9f2d4151e704b86f3c0127ba3fc71a79a2bb4c29876
130 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The PDF was flagged by a machine learning classifier with high confidence and also detected by ClamAV as Pdf.Exploit.Dropped-78. Heuristics indicate an embedded script payload and an embedded file, suggesting the PDF is a dropper. The embedded URLs, while mostly unknown or benign, are present within the document structure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • 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 0xC8 11618 bytes
SHA-256: 0f001c9151445cfeefc60e22c2a089750357f9d1e5d531c3e62ad97ff63d5cc4

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