PDF malware analysis — malicious · 42116b6f903c3e7a

MALICIOUS

PDF

535.1 KB

MD5: bc3e82bb85c24e7db50f6e38d9820d48 SHA-1: 7c6ee2f2f2ab712d7b28e72fa5bf7f97a104c622 SHA-256: 42116b6f903c3e7af66be857f4e6611233dddf9eb1bc46062cbdec2c69c4181d

210 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains an embedded script payload and a launch action, indicating an attempt to execute malicious code. The script appears to be obfuscated, but the presence of `cmd.exe /C` and `Scripting.FileSystemObject` suggests it is designed to download and execute a second-stage payload. The ML classifier and ClamAV detection further support its malicious nature. The specific family is not identifiable from the available evidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9988

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
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_pdf_script_000859bf.bin` `3b83126a353372314fc0c178f9d28137df1d9552e2e06c421aa466b30e62ca1b`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x859BF	547780 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 1 long hex-escaped blob(s).

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