PDF malware analysis — malicious · 2d37291d3f9e8f7d

MALICIOUS

PDF

289.4 KB

MD5: eb0bc92b9990cd06093f5dbebe6bf1e3 SHA-1: 4790cbab2df474eda805e41414e33521cd535feb SHA-256: 2d37291d3f9e8f7dea6fbbdfdfd75e47c846cebd95511ba89db3fc0110395831

210 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The PDF file contains an embedded script payload, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. The script itself appears to be obfuscated but the presence of 'cmd.exe /C echo Set o=CreateObject^("Scripting.FileSystemObject"' suggests it attempts to execute commands. This is further supported by the PDF_LAUNCH heuristic, indicating an action to launch an executable. The ML classifier and ClamAV also flagged this file as malicious.

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_000482d7.bin` `5d19b4efd39a218069240955a75b99bcbec7399c3760ba5867f14e8895fe8e5f`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x482D7	296228 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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