Malicious PDF — malware analysis report

Static analysis result for SHA-256 6579303d54cf58e8…

MALICIOUS

PDF

43.7 KB First seen: 2012-06-14
MD5: b2dd43bc6cc5176637371507a46038f9 SHA-1: 197cba9c5cb96df56d83baf7aba63ba69926a57b SHA-256: 6579303d54cf58e888afd73e408d2fc1bb2b7ece84e4a8ea150e89a188cc012c
230 Risk Score

Malware Insights

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

The PDF file contains a malformed active-content stream and a high-severity heuristic firing for XFA form script execution, indicating an exploit. ClamAV also detected this file as Pdf.Exploit.Agent-36830. The embedded script likely attempts to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • 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
    • http://ns.adobe.com/xfdf/In PDF document text
    • http://www.xfa.org/schema/xfa-form/2.8/In PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD7 46 bytes
SHA-256: 0a2224c4023b216235b61c3fc4dd17bbfac1ab23a545687f51b97604cf654712
embedded_file_obj0009.bin pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x14D 689 bytes
SHA-256: a2fda93aac74f02c92ed3dc5906787578c14c270098c75d62adc0b51b0f769ab
embedded_file_obj0010.bin pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x449 183 bytes
SHA-256: b9dc770324ae2a66fd1d9c8b9605e3a9ddaae9d1311dffe002d37a59fdc6e4bc
embedded_file_obj0011.bin pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x54B 349 bytes
SHA-256: b6a3ee7f72d667ec139154bf7e80c24d47ed81f6fc9bb78a7a931a3667e463b4
embedded_file_obj0012.bin pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6F3 190 bytes
SHA-256: d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea
embedded_file_obj0014.bin pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7FE 42002 bytes
SHA-256: 770f8d4a76c001e08b0a57af4363e4fdc8b6cdfd0c0ccce3ef1dde7ca06c2210
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely
embedded_file_obj0015.bin pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xAC5A 68 bytes
SHA-256: 78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95

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