PDF malware analysis — malicious · c4867e7103f58407

MALICIOUS

PDF

57.1 KB

MD5: 9b1492faa86318584999609bf4eb4c35 SHA-1: 840c7c3f154015f11e591ed4fac8c76ecc0f9e67 SHA-256: c4867e7103f58407c0de1f0b1dd03df3bac9ca3ac941ecddf5854c3349834ff8

274 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and an embedded file named 'sheet.xls', which itself was detected as a downloader by ClamAV. The presence of these embedded artifacts, combined with PDF-specific heuristics indicating JavaScript actions and potential exploit indicators, strongly suggests the file is designed to download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
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 high 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.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`sheet.xls` `fe5f62873ebce1a94a5481a5933e069d2dbd98954e0031688d45baa8238fc14c`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x344	28672 bytes
Detection ClamAV: Doc.Downloader.Generic-6698421-0 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`javascript_obj0001_000.js` `1c58d89f05bed35ad5954c93fcbda546a20637a71503ba0b75360b3c1d3db92f`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	59 bytes

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