PDF malware analysis — malicious · a757776f354dad22

MALICIOUS

PDF

60.1 KB

MD5: b245a95ae5031818be0d0ef18441c721 SHA-1: cec76f5ea23d8f0901537ba2bde1ba4f13b0ba6a SHA-256: a757776f354dad227ce2683814ec77b199255146684ba23dabc8ec8f26d7f715

274 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript and an embedded document (doc.doc), both flagged as suspicious. ClamAV identified the file as a downloader. The embedded JavaScript is likely responsible for initiating the download of the secondary payload from a remote source, which is then executed. The ML classifier strongly indicates maliciousness.

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
`doc.doc` `a8b7eccc03848d160ca1049676c2cd34313939ff5f863869794cb61d6a58e5af`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x33E	30208 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` `66383b4195993099ace1c034f0e70e69cbaf49f6284d460a369cef947821be6b`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	57 bytes

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