Malicious PDF — malware analysis report

Static analysis result for SHA-256 c958039a10fd5c66…

MALICIOUS

PDF

15.4 KB First seen: 2012-09-24
MD5: 5a063159c1498d4eca3d1ff98d13c919 SHA-1: bd8dfae2d7c6297f6d43d7be2f0a9f5bb8d3cb5e SHA-256: c958039a10fd5c66cc9fc9d3cca0d226f4152c8a49bc74f97cbddd95ee0dba20
72 Risk Score

Malware Insights

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

The PDF file contains an embedded script payload and an embedded file, indicating an attempt to deliver a secondary payload. The heuristics suggest that the embedded file is the primary artifact of interest, likely an executable. The document body contains obfuscated JavaScript-like code, but it is too fragmented to determine its exact function. The embedded URLs are related to Adobe XFA, which is a legitimate technology, but do not appear to be malicious in this context.

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 0xC6 15009 bytes
SHA-256: 45831d6f15394ffd4de8b74a963a81aa03cf711f17423c524f5165ce75476876
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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