PDF malware analysis — malicious · f7327fe179701e57

MALICIOUS

PDF

244.6 KB

MD5: fe1cf90238be4fc94adcbb61c0bd4e13 SHA-1: 232cd4102dc5ca2092ace4a8c397a10bea9d8f45 SHA-256: f7327fe179701e576150463da468886fb8e27eb1e41575dc30664ac5cd5ac06d

330 Risk Score

Malware Insights

MITRE ATT&CK

T1059.003 Windows Command Shell T1204.002 Malicious Link

This PDF file contains a critical PDF_LAUNCH heuristic firing, indicating an attempt to launch cmd.exe. This is further supported by the PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_LAUNCH_COMMAND heuristics, which reveal an embedded script designed to execute commands. The ML classifier and ClamAV detections strongly indicate malicious intent, classifying it as a dropper. The embedded script likely downloads and executes a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

Launch action critical PDF_LAUNCH

PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
/Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND

PDF /Launch action specifies an executable target with parameters '/c echo Set fso=CreateObject("Scripting.FileSystemObject"' — references a known-dangerous executable (cmd, PowerShell, etc.).
ClamAV: Win.Trojan.Dropper-132 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Dropper-132
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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_0003cc90.bin` `75be2d5fd64452550e4a0c64e802d333876991be83cd3ba1c0220ee2753c899c`	pdf-embedded-script	PDF raw stream script payload at offset 0x3CC90	248955 bytes
Detection ClamAV: Win.Trojan.Dropper-133 Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s).

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