Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc5e127a6ebfe9e…

MALICIOUS

PDF

6.1 KB
MD5: 754f6cadd5fa9a180ef44450388f40e0 SHA-1: 55c47363703e1ea095c31a59c9fbf6999f1ee23d SHA-256: 7dc5e127a6ebfe9ee2734859ad0ca534d7e2694b2d05a8550c9b1e7ad2df4319
106 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 the presence of embedded files. ClamAV detection as 'Heuristics.PDF.ObfuscatedNameObject' strongly suggests a known malicious pattern. The combination of these factors points to an attack leveraging PDF vulnerabilities for payload delivery.

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
58e843fbc2e87d930bf18739e44ab66c31ee5c4f192b7ea77b276a510afea522		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x19E 1405 bytes
embedded_file_obj0010.bin
8af81ed8eb133b8dbc92f16ee731a72b4418c73f308df25baea192d921e616d2		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0xF43 256 bytes
embedded_file_obj0011.bin
26eeabc97406acb2e7b8b2d44354cecf3db4d4fb803903dcba504946e716ad70		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x1272 725 bytes
embedded_file_obj0012.bin
422a5430698c54d7acba092e1350d18143964b54c5496415f1d8f31cbbcf0663		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x15A1 332 bytes

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