Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20e023419e41985…

MALICIOUS

PDF

5.8 KB
MD5: 2f9dfd45470025b93e9f5ab23b62c54a SHA-1: 10a8993d2649a882f47a6b81b7f8b19fad349c9b SHA-256: d20e023419e419858238bd8a1e1dc3bb28e581b421d2a95d4d1c729dfdfa8e09
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file exhibits multiple indicators of malicious intent, including the use of ASCIIHexDecode filters with exploit indicators and an ML classifier flagging it as malicious. ClamAV also detected it as Heuristics.PDF.ObfuscatedNameObject. The presence of embedded files suggests the document is a dropper designed to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

Heuristics 6

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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.

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
1559a0c20da4a7fd691f5f5447d091ee0fa06ac54029af31bd90890b1c7617f2		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x25C 1492 bytes
embedded_file_obj0010.bin
8af81ed8eb133b8dbc92f16ee731a72b4418c73f308df25baea192d921e616d2		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0xEF1 256 bytes
embedded_file_obj0011.bin
9e9a910a7444a46e3a551a43bdae91b886d9ab789dd6df57c06c9af18caa92db		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x1233 896 bytes
embedded_file_obj0012.bin
422a5430698c54d7acba092e1350d18143964b54c5496415f1d8f31cbbcf0663		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x1480 332 bytes

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