PDF malware analysis — malicious · 45afd7c4f6e1e39c

MALICIOUS

PDF

57.1 KB

MD5: a38d0e4f9b24a9604ab1041028d20712 SHA-1: bb275aa0f49a0386672cfd1406b5dce5babce6aa SHA-256: 45afd7c4f6e1e39cb4195b2f854ca082de2cfb413cf36a340eb7f486b0a80be5

274 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

This PDF file contains embedded JavaScript and an embedded XLS file, both flagged as malicious. The ClamAV detection 'Doc.Downloader.Generic-6698421-0' and the ML classifier strongly indicate malicious intent. The embedded XLS file, named 'sheet.xls', is likely a lure to trick the user into opening it, which would then execute the embedded script. The script's purpose is 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` `095606d1fd93585812a0b934d1651bc99709e3f69a7d7e74a11e9498dff214be`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	59 bytes

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