Malicious PDF — malware analysis report

Static analysis result for SHA-256 6053f5957ab3a824…

MALICIOUS

PDF

5.7 KB First seen: 2013-01-28
MD5: 0e80f176a4d27c7571c8df19b49f0c24 SHA-1: e5d8d8501dd0f168e74438318d2a0c5b0ab36962 SHA-256: 6053f5957ab3a8245f52f0aa45333062b678500a04567c89260be040ce9c94aa
72 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers as malicious and contains malformed streams indicative of exploitation. It also contains an embedded file and script payload, suggesting it's designed to download and execute further malicious content. The benign URLs present do not detract from the malicious indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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/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 0x78 5090 bytes
SHA-256: c35dbaee4cdc8097ede38736094a3802b8a448c88093d4c8a59038cfb51dbeff
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 long base64-like blob(s).

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