PDF malware analysis — malicious · 199f8643333c48f2

MALICIOUS

PDF

289.4 KB

MD5: 1c1f2fa94a9b51eec3addf8232904841 SHA-1: 8c79a585c1ef9a8277539bc89994826b1621ea60 SHA-256: 199f8643333c48f21673a717e464ade559f01ca9e6da349ae4dcf0110c087c0c

210 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains an embedded script payload, identified by multiple high-severity heuristics. The script is likely JavaScript, as indicated by the PDF context and the nature of embedded scripts in PDFs. The script's purpose is to execute arbitrary commands, as suggested by the 'PDF_LAUNCH' heuristic and the presence of script execution terms in the static triage. The ML classifier strongly indicates maliciousness.

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_000482da.bin` `b537d617a23173af5dcd1bea8bf417b34d9bfbace6d3470e918f7f96ac215a7f`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x482DA	296255 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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