Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dcad0c2122e35c…

MALICIOUS

PDF

12.0 KB
MD5: f3604e0aca1d7742ccdb3f6457efe181 SHA-1: ea1a53a6d69d98d2ba5890fed08b244bc6130901 SHA-256: 63dcad0c2122e35c27a2d459e9b3edc22540122bb521cf71b73c9df6089ba151
130 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample utilizes an XFA form and ASCIIHexDecode filter, indicating a potential exploit. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded file and the unknown reputation URL are highly suspicious and likely part of a multi-stage attack, where the PDF serves as a dropper for a malicious payload.

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://xcarab.ru/Rrotj8YyvOc5HSxdiNzrTPeBu4Ky4a1K?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
d205b9035a4d4239ab0ed8b03bfb8accb237c6f66f90d8d84a566390290a9b0e		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x5A 1875 bytes

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