Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b448ae144ad6696…

MALICIOUS

PDF

17.9 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: 26870932913110bde439829b55d88280 SHA-1: d1cb8d8ff358461c6e4cfa8f77eefca1bfd2fb33 SHA-256: 5b448ae144ad6696fe1f92c793effeacf0f0da1f51a6a34dfc0dfc0cc293b34d
198 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains XFA forms with executable scripts, flagged by multiple high-severity heuristics including PDF_EVAL and PDF_XFA_SCRIPT. ClamAV detection as Pdf.Exploit.Dropped-81 further confirms its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for initial compromise via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 (matched inside decoded stream)
  • 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 low 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.
  • 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x1E5 84 bytes
embedded_file_obj0009.bin
24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x294 228 bytes
embedded_file_obj0010.bin
b756779d88f05363edb5b117e194ea0e2a547279bda88153ee1f6cbd981d5d92		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x387 1283 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0011.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x69B 199 bytes
embedded_file_obj0012.bin
98f7621e68158b2615fca95d655a3a5acb70f19fa739b6507750c0cf15b3fb6d		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x78D 34561 bytes
embedded_file_obj0013.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 13 at offset 0x42BC 77 bytes
embedded_file_obj0014.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x4363 56 bytes

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