Malicious PDF — malware analysis report

Static analysis result for SHA-256 f256e45247958eb4…

MALICIOUS

PDF

42.4 KB First seen: 2013-08-22
MD5: 2edeae2a847faf19ecb8a54be453c4d6 SHA-1: a6b8ecd8e4eed5842fb94a483b5a64059161d4b9 SHA-256: f256e45247958eb42b0b1d7306acfd3a12634fb3d7e304456597c8d6ef1b0dcc
190 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1566.002 Phishing: Spearphishing Attachment

The PDF was flagged by multiple critical heuristics, including ClamAV detection (Pdf.Exploit.Agent-36830) and an ML classifier, indicating it contains an exploit. An embedded file object was also identified, likely serving as the payload delivery mechanism. The presence of XFA forms and embedded scripts further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • 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/1.0/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 42678 bytes
SHA-256: 71166958fa7ed7ea2ac5db32cfc5a039d9e93e2e9c35abee274555cdcefcf27d
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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