PDF malware analysis — malicious · 837516913c40eade

MALICIOUS

PDF

289.4 KB

MD5: 7f6fd0dcdb6adfd2741e66a918a3a620 SHA-1: 584f2155f3be774913f7732c209b075b5a868d18 SHA-256: 837516913c40eadeaab4fb5ac8207980583a7c4e07187c2c5bb97a37aa419146

210 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains a launch action and an embedded script payload, flagged by multiple heuristics including ClamAV and an ML classifier. The embedded script, named 'embedded_pdf_script_000482d9.bin', is likely responsible for downloading and executing a second-stage payload, as indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'EXTRACTED_FILE_STATIC_TRIAGE' firings. The DOC BODY excerpt suggests the script may involve command execution and environment variable expansion.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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: Pdf.Dropper.Agent-7278089-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7278089-0
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_000482d9.bin` `3292fc6db807bd30642971e72da156a65cad96a88fce1d6fa438b053787ff488`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x482D9	296231 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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