Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab152a4c2c8ade9…

MALICIOUS

PDF

35.8 KB First seen: 2013-07-13
MD5: aa793833af0aed9f069c432c75aedb2b SHA-1: f3ea0a63fcc45da8c26cac93bca7b2cb6ff2ffc9 SHA-256: 5ab152a4c2c8ade96af8c8e089113b0e1b0c97ea7e3f8c394ef974e3f8228271
70 Risk Score

Malware Insights

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

The PDF contains a malformed active-content stream, indicated by the 'PDF_MALFORMED_EXPLOIT_STREAM_LENGTH' heuristic. This suggests an attempt to exploit a vulnerability within the PDF reader to execute arbitrary code. The 'ML_NYX_PDF_MALICIOUS' classifier strongly supports this assessment. No specific malware family could be identified, and no URLs or scripts were extracted for further IOCs.

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 671 bytes
SHA-256: f8969e4ffff2d63b5c0f6f91b2974019e0abbc42c0f8365ca1d2a68f83da9ffb
embedded_file_obj0010.bin pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x41C 150 bytes
SHA-256: dcb0971ac46b2a38afa00b4a134a86e3915dbef7754e68c22f3c90205b23cb18
embedded_file_obj0011.bin pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x4F7 437 bytes
SHA-256: 919311c4f3a5f8d631c55fffd296ccf550fdb5d7b4350edc85e72b711cfc5686
embedded_file_obj0012.bin pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6F1 181 bytes
SHA-256: 072090be5ea6c4a216543a1d4332d27d322264f3038bbd986db2a09048143a1c
embedded_file_obj0014.bin pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7EC 34006 bytes
SHA-256: 4a2eeb76e39807e8e876e0af534feaf4dde15ef5adb751db783047121b54836e

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