Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5fe5f9d3d1386e…

MALICIOUS

PDF

29.0 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: c6902c26a89aaa50324bbb1cfe38c79d SHA-1: 97a64e3c48aee717c8c966c2c19cc903a3670eee SHA-256: fc5fe5f9d3d1386ea81e022d206a3d698288ceaeddf69af6326156f14a5bf87e
208 Risk Score

Malware Insights

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

This PDF file exhibits multiple high-severity heuristic firings related to embedded content and executable scripts within XFA forms. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded files and the 'eval()' call suggest the PDF is designed to exploit a vulnerability and likely download a secondary payload, as indicated by the ClamAV signature 'Pdf.Exploit.Dropped-81'. No specific document body text was available for further analysis of the lure.

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 0xDB 67 bytes
embedded_file_obj0009.bin
38c81935ce11af5f7ac843faedee50e3f72f9fb62219a5761db7ba2d82e88742		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 65 bytes
embedded_file_obj0010.bin
1657e64bf7dd0309634011138c08b313df0ce6c7a7ceab4a16e4233234ed5a89		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x1E8 782 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0011.bin
b39af078795c6535f459d93166f85b2672a5ef2f68c4bd9c097dbc7900599131		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x53B 26652 bytes
embedded_file_obj0012.bin
21b01495e2d7c0774b4429ccf26f1898036a428722b50755823b1f5e076736be		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6D9C 314 bytes
embedded_file_obj0014.bin
f87eb6de05cca8bc3ae4439301ffeb174f2ccce13082198ed2509bd8b4519ed8		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x6F1B 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 0x7003 77 bytes
embedded_file_obj0016.bin
6f0c029b6d16ee8c8a055ce3c9de61abb4666ed853aba10079b3dc0c4a5f3999		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x7094 67 bytes

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