PDF malware analysis — malicious · 770ab22a3642d010

MALICIOUS

PDF

159.4 KB

MD5: 891d09897cd70b635e5762fdd88422ae SHA-1: 46433809d4a14a0cb8c1553733be843905cf659a SHA-256: 770ab22a3642d01023b3a1ff19693a596b1e967bb425fc88cdab1e9e52f48cbf

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.003 Windows Command Shell T1204.002 Malicious File

The PDF file contains a critical PDF_LAUNCH heuristic firing, indicating an attempt to execute an external program. Further analysis reveals this program is cmd.exe, which is launched with parameters to echo a script. This script likely downloads and executes a second-stage payload. The PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic confirms the presence of embedded script content, further supporting the malicious intent.

Heuristics 4

Launch action critical PDF_LAUNCH

PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
/Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND

PDF /Launch action specifies an executable target with parameters '/C echo Set fso=CreateObject\("Scripting.FileSystemObject"\' — references a known-dangerous executable (cmd, PowerShell, etc.).
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction that launches, submits, or opens an external target
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_pdf_script_00000068.bin` `b289cef1c6d42db57796e339d06e228f2bab7a9d886548cdd581dd767028015d`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x68	552 bytes

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