Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef6aea0ea9f60aa…

MALICIOUS

PDF

69.3 KB Authoring application: Crystal Reports (via Powered By Crystal)
MD5: bd4df5968df3727322e71cb64a5cf9d2 SHA-1: 4cd1cd43e91f3c22e481005c8505cfde9599aa40 SHA-256: 8ef6aea0ea9f60aa01485909a2148d74914f90bf2eb408c1e1f89aaf1f1affce
62 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains an embedded JavaScript stream and multiple embedded files, as indicated by the PDF_JS and PDF_EMBEDDED heuristics. The ML classifier also flagged this PDF as malicious. These components suggest the document is designed to execute malicious code or download further payloads. The specific intent of the embedded scripts and files could not be fully determined due to obfuscation or truncation, but the presence of these elements strongly indicates a malicious delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7205

Heuristics 4

  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0049.bin
f594fc906b5cc249901bc4dbec5ea4e465df820c83fa5bca12c3640fe1c530a8		 pdf-embedded-file PDF EmbeddedFile object 49 at offset 0xD9C5 30234 bytes
embedded_file_obj0047.bin
d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777		 pdf-embedded-file PDF EmbeddedFile object 47 at offset 0x10BD1 84 bytes
embedded_file_obj0048.bin
24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0		 pdf-embedded-file PDF EmbeddedFile object 48 at offset 0x10C83 228 bytes
embedded_file_obj0050.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 50 at offset 0x10D74 199 bytes
embedded_file_obj0051.bin
846dfecc0c93797cb6db4301f6af323fffd76ffdf8c053c439495412785138e7		 pdf-embedded-file PDF EmbeddedFile object 51 at offset 0x10E65 119 bytes
embedded_file_obj0052.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 52 at offset 0x10F1D 77 bytes
embedded_file_obj0053.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 53 at offset 0x10FC4 56 bytes
stream_002_off00000c8e.bin
abad6f91eafdb0e083580077f31cb616896fd8ea7751010400f0df402685eed0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC8E 34056 bytes

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