PDF malware analysis — malicious · e9fc031270f0b99e

MALICIOUS

PDF

MD5: 0cb463e687c3f3d037d712a0154ad2a2 SHA-1: 66b767f6523ecd1a99473ff56c6913d762ba8264 SHA-256: e9fc031270f0b99ed7adec8c18bb96d3fcf9aaf01739db4fe365c0ce131d0723

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as a downloader. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, as is typical for this type of malware delivery. The PDF itself appears to be an image-only lure, a common tactic to bypass basic content inspection.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

ClamAV: Doc.Downloader.Donoff-10030369-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Donoff-10030369-0
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.
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
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`MAAII6L.docm` `9b2c435aa49de98337bb8f4a26c41d975b79d94f2003929a3dc4b816d5c20dd2`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x826	75010 bytes
Detection ClamAV: Doc.Downloader.Donoff-10030369-0 Obfuscation or payload: unlikely
`javascript_obj0006_001.js` `a7fe93767942c5e16a56ddf8fabc1ad0d1c49e9f3976aedaa6b06749f7d3e1e0`	pdf-javascript-stream	PDF /JS object 6 at offset 0xFB6C	4565 bytes

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