Malicious PDF — malware analysis report

Static analysis result for SHA-256 387f4a8622b70f6f…

MALICIOUS

PDF

29.0 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: 192871ed4fa979b54306134a69986aba SHA-1: 01578a16b1f3ad706d540ac3ea4e672b4b4730aa SHA-256: 387f4a8622b70f6f7a8b5e03abffb270aeb3643672c5355a4ced6877d1426d71
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV with the signature Pdf.Exploit.Dropped-81. High severity heuristics indicate the presence of XFA forms containing risky executable scripts and eval() calls, suggesting an exploit is embedded within the document. The ML classifier also strongly indicated maliciousness. The embedded file artifacts further support the conclusion that this PDF is designed to drop and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 8

  • 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.Dropped-81 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • Embedded script payload in PDF stream medium 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 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
  • 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/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD7 67 bytes
embedded_file_obj0009.bin
38c81935ce11af5f7ac843faedee50e3f72f9fb62219a5761db7ba2d82e88742		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 65 bytes
embedded_file_obj0010.bin
0c731745dece541851895b880d045401950d97b1566366ff1ead9878db3c02f8		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x1EE 802 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0011.bin
58188898595585f3eea2cda987f7d973ec2e8b5d01f72bd52cd8adeed8ffa0f3		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x55B 26585 bytes
embedded_file_obj0012.bin
103d1e7983cf88bfacedddb4af33ffb5317d9c2c8b3e1bfd987b2c5d712bc985		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6D7F 323 bytes
embedded_file_obj0014.bin
f87eb6de05cca8bc3ae4439301ffeb174f2ccce13082198ed2509bd8b4519ed8		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x6F0C 164 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0015.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0x6FF6 77 bytes
embedded_file_obj0016.bin
78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x708A 68 bytes

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