Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c496a9a9fa8b2b7…

MALICIOUS

PDF

12.0 KB
MD5: 562f282632912a0055aafb9a35f69d9a SHA-1: ec81e5443ea1a1e2f52de8186a2edd1c8f1244e9 SHA-256: 6c496a9a9fa8b2b764697490d16f42c130ab55258ddc6131949577b310fce628
130 Risk Score

Malware Insights

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

The PDF file contains embedded content and utilizes ASCIIHexDecode filters, indicating an attempt to obfuscate malicious code. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of a PDF vulnerability. The presence of an unknown URL points to a download and execution chain for a second-stage payload, consistent with common exploit delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-90 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-90
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://a9u.ru/vU7vnUM2jIXm3AObdImORJZpVHr4lm2n?pp=1?plugin=1
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.4/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
b3095fbc6a1fb500ad828b26caf0a35cd261fd1bf5cb318bde63460f8345e573		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x5A 1872 bytes

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