Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4aa8c2c62b8fad4…

MALICIOUS

PDF

35.7 KB First seen: 2013-08-22
MD5: 53e4ca378cbfc174f65ab59a92948c63 SHA-1: bb867de211e39c650c0dac3e5467c0488b6b8802 SHA-256: e4aa8c2c62b8fad423bc226f66608d28a31894dbacea3e52855a254ce7cb2674
70 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file exhibits multiple indicators of malicious intent, including embedded files and a script payload. The presence of XFA forms and embedded files points towards a delivery mechanism for potentially harmful content. While the specific script functionality is not detailed, its embedding within the PDF stream strongly suggests it is intended to execute a malicious action, such as downloading a second-stage payload.

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 673 bytes
SHA-256: db3de36864cebd09089ca8e66d01e20660b7ecfe2f216003b6e335ec5cae4390
embedded_file_obj0010.bin pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x41E 152 bytes
SHA-256: ea26e20ae9fbb8780934fbb1b4fb8821b53649f0ca29c3cd1d2291db6e510f36
embedded_file_obj0011.bin pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x4FB 437 bytes
SHA-256: 919311c4f3a5f8d631c55fffd296ccf550fdb5d7b4350edc85e72b711cfc5686
embedded_file_obj0012.bin pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6F5 181 bytes
SHA-256: 072090be5ea6c4a216543a1d4332d27d322264f3038bbd986db2a09048143a1c
embedded_file_obj0014.bin pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7F0 33903 bytes
SHA-256: fd4078cbab4484568dd49d8d7ba052876e9a581dcccbd73a34417c6b2e0f3e8e

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