PDF malware analysis — malicious · 8b949b8d6efd20a1

MALICIOUS

PDF

142.7 KB

MD5: 8fde799549c0ce7b6f6c826492eafb22 SHA-1: e07696b8c6c722cd4b1ae194fbcd86330dd3de20 SHA-256: 8b949b8d6efd20a152faa16cfeb25ff958eb050dfe03a2b7398c9b23b757992b

240 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell T1140 Deobfuscate or Obfuscate Malicious Code

The PDF file contains a launch action that executes cmd.exe, which in turn appears to be part of a script designed to download and execute a Windows executable payload. The heuristic firings indicate a base64-encoded PE payload and an embedded script, strongly suggesting a downloader or droppper functionality. The reconstructed command line indicates the script attempts to create a FileSystemObject and likely proceeds to download and execute the embedded payload.

Heuristics 5

Launch action critical PDF_LAUNCH

PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
Base64-encoded Windows executable payload in PDF critical PDF_BASE64_PE_PAYLOAD

PDF text contains a long base64 blob that decodes to a verified Windows PE executable. This catches payloads hidden after EOF, inside comments, or in plain text outside normal PDF streams.
/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.).
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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`acroform_b64_00.js` `c5f47a92068cd88fe45e9a7b6e84651d576142ef8b22d865eec8d2d975643605`	deobfuscated-js	PDF AcroForm base64 (raw) at offset 0x2DE	107520 bytes
`embedded_pdf_script_00023386.bin` `47684e4c7df0cffde4da407fe4c0b1dacea5f4cbc053eae928ebe1687018ef44`	pdf-embedded-script	PDF raw stream script payload at offset 0x23386	144659 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 long base64-like blob(s).

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