PDF malware analysis — malicious · 903b8b448d37aa79

MALICIOUS

PDF

244.6 KB

MD5: 1dcd4a3f5d05433fcebf88d9138a1966 SHA-1: 0831b75b036bdfc8d17a95b7ebe5bf972da3bc06 SHA-256: 903b8b448d37aa797f09e443ebed56a24980912cd19d9b67e0174cd1e84e8ade

330 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF document contains a critical PDF_LAUNCH heuristic, indicating it attempts to execute an external program. Specifically, it targets 'cmd.exe' with parameters that suggest the execution of an embedded script. This script, identified as 'embedded_pdf_script_0003cc93.bin', is also flagged by heuristics as a suspicious payload. The ML classifier and ClamAV detections further support the malicious nature of this file, classifying it as a dropper.

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_0003cc93.bin` `3e315d13265e30c8b43516fed3d7895bccd40c97cb2da0bfe1d352fc2b62c863`	pdf-embedded-script	PDF raw stream script payload at offset 0x3CC93	248958 bytes
Detection ClamAV: Win.Trojan.Dropper-133 Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s).

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