PDF malware analysis — malicious · b178aadc33c511e6

MALICIOUS

PDF

149.1 KB

MD5: 77cd77b85368911f8a28c490019c8e05 SHA-1: 3a7de573c8017b394480a16cd866e9a82c10992d SHA-256: b178aadc33c511e6ff1311d6057ed335bcbfd76660267041b9e2120f61515887

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains an embedded script payload, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. The PDF_LAUNCH heuristic further suggests that this script is automatically executed upon opening the document. The script itself appears to be obfuscated but contains elements that suggest it attempts to download and execute a second-stage payload from a remote source, likely using PowerShell given the command-line fragments observed. The CLAMAV_DETECTION heuristic confirms the malicious nature of the file.

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_000251af.bin` `151c38cb0988c71e1bb084a254a4fa0510f22c95ea56f4ab81a258302f6ad7b6`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x251AF	152572 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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