Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b8fb627cf200e1…

MALICIOUS

PDF

31.4 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: f9459b2b00e602069de06d52ff4ed8e8 SHA-1: c80df70dc2845f5fa8f2abd99945b8898ae4b5c8 SHA-256: 26b8fb627cf200e13ebd96290be3cbd3f5cefb8056b781abb2f1bd06d9b08d8c
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, indicating it is a known exploit dropper. High-severity heuristics for PDF_EVAL and PDF_XFA_SCRIPT confirm the presence of risky executable script within the XFA form. The ML classifier also strongly indicated maliciousness. The embedded file and script suggest the PDF is designed to download and execute a second-stage 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 0xDB 67 bytes
embedded_file_obj0009.bin
38c81935ce11af5f7ac843faedee50e3f72f9fb62219a5761db7ba2d82e88742		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x167 65 bytes
embedded_file_obj0010.bin
fab652aeafc7c57a625248c62ce1fedb2d447ca39d739aea024ad89c1211dadb		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x1F3 784 bytes
embedded_file_obj0011.bin
e39e2a91b731975655e8dad949a58491ecdb33051a1ecb402ffa1926dd97e3fa		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x54E 29049 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0012.bin
103d1e7983cf88bfacedddb4af33ffb5317d9c2c8b3e1bfd987b2c5d712bc985		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x7712 323 bytes
embedded_file_obj0014.bin
f87eb6de05cca8bc3ae4439301ffeb174f2ccce13082198ed2509bd8b4519ed8		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x789F 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 0x7989 77 bytes
embedded_file_obj0016.bin
78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x7A1D 68 bytes

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