Malicious PDF — malware analysis report

Static analysis result for SHA-256 c393231210854408…

MALICIOUS

PDF

16.4 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap First seen: 2013-08-16
MD5: 2ed79367da8de3beff6ea7cc1e8505ea SHA-1: 1fc78abfc313d0555928e112585f018e4a4f9dc9 SHA-256: c393231210854408ac4782ea6abadcf7a53d59074776f06f9484d3b9e05b290b
132 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as 'Pdf.Exploit.Dropped-81'. The PDF contains embedded files and XFA forms, indicating a complex structure likely designed to conceal malicious content. The presence of embedded script payloads and the 'ML_NYX_PDF_MALICIOUS' firing strongly suggest an exploit attempt to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • ClamAV: Pdf.Exploit.Dropped-81 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://ns.adobe.com/xtd/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://ns.adobe.com/xfdf/In PDF document text
    • http://www.xfa.org/schema/xfa-form/2.8/In PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD7 67 bytes
SHA-256: 04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51
embedded_file_obj0009.bin pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 781 bytes
SHA-256: e2e0f6c5cb2e0b2697da89386bfc3718eedaf1b6a2b1d24dd1176d27117bf77a
embedded_file_obj0010.bin pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x4BA 81 bytes
SHA-256: 45c6313a70c534019cc5824825e927269c8e9e5955559ca35419268e1686932d
embedded_file_obj0011.bin pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x556 13776 bytes
SHA-256: 50c54db56981441c0bddf2d66fea3eccb20683e351bc6f6b63140413f164dcb8
embedded_file_obj0012.bin pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x3B71 323 bytes
SHA-256: 103d1e7983cf88bfacedddb4af33ffb5317d9c2c8b3e1bfd987b2c5d712bc985
embedded_file_obj0014.bin pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x3CFE 161 bytes
SHA-256: 9342db065cdcaf52cc1c03a167a9ee6da4adf7b601ac8728eb048874abd6ddf7
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0015.bin pdf-embedded-file PDF EmbeddedFile object 15 at offset 0x3DE5 77 bytes
SHA-256: e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876
embedded_file_obj0016.bin pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x3E79 68 bytes
SHA-256: 78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95

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