Malicious PDF — malware analysis report

Static analysis result for SHA-256 178560207681e724…

MALICIOUS

PDF

12.1 KB
MD5: fbe8fb2d270c8bfd6a4cf3c75d4c818f SHA-1: 0ddce6376f7d0d30c1d97e061349a81270b5dbce SHA-256: 178560207681e724aae8237109cac781689161d6507021525d4c3c2665a8ef05
130 Risk Score

Malware Insights

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

The PDF file contains embedded content and uses ASCIIHexDecode filters, indicating an attempt to obfuscate malicious content. The ML classifier and ClamAV detection strongly suggest maliciousness, likely through exploitation. The embedded URL is highly suspicious and likely serves as a download location for a second-stage 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://46.16.240.18/9VBMa76FFnB4VAYu0X5j755pMiSyVrcV?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
13e65dce63c55fa1244a37466902ee8b197f846327911a81a0abb6167aaa48d2		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x5A 1878 bytes

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