PDF malware analysis — malicious · 5871df1f1d20e823

MALICIOUS

PDF

289.4 KB

MD5: 6056585b5e085326431c0e80d45cedc0 SHA-1: c611f72353da6d87fc09b0bae9798abda2208c44 SHA-256: 5871df1f1d20e823ba1e7577745d263defac5300999ceb8d4f97540050f5060d

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 it's designed to execute malicious code. The script appears to use cmd.exe to construct and execute a command, likely to download and run a second-stage payload from a remote source. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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_000482f5.bin` `5c8d6b98ac1feaaa157e9bad23ebd32d6c8a8241fa4d4288f68f9225a25d9d94`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x482F5	296258 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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