Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccff03fbda427d6…

MALICIOUS

PDF

35.8 KB First seen: 2013-08-11
MD5: bcf2c5fdb327b573ba587f0e889883f7 SHA-1: b180c6cac1938ed05d8db1a44d9c687298284fdd SHA-256: 6ccff03fbda427d66e083e1f7f60a77f4ee1aa7a9d80e586a61e846e839d5f0d
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains malformed active content and embedded script payloads, strongly indicating an exploit attempt. The ML classifier also flagged it as highly malicious. The embedded JavaScript is likely designed to download and execute a secondary payload, a common technique for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 46 bytes
SHA-256: 0a2224c4023b216235b61c3fc4dd17bbfac1ab23a545687f51b97604cf654712
embedded_file_obj0009.bin pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x138 672 bytes
SHA-256: 27bdf2cdd5fcd2edf1d51109c19a1e799f6fafb0386ecc8c440ee71e4d56fb86
embedded_file_obj0010.bin pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x41D 151 bytes
SHA-256: ebc0ecafc9cfc8d85b1d58f7b4e5115be7b7b6fec7a60b56eb2920c27f24b57f
embedded_file_obj0011.bin pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x4F9 437 bytes
SHA-256: 919311c4f3a5f8d631c55fffd296ccf550fdb5d7b4350edc85e72b711cfc5686
embedded_file_obj0012.bin pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6F3 181 bytes
SHA-256: 072090be5ea6c4a216543a1d4332d27d322264f3038bbd986db2a09048143a1c
embedded_file_obj0014.bin pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7EE 33950 bytes
SHA-256: 38240cba0d39738692782c5373ed9e0db8b6ba838ddeb77dcaaa6a6047b065d3

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