PDF malware analysis — malicious · 93fc24573bd563f0

MALICIOUS

PDF

30.9 KB First seen: 2019-11-20

MD5: 56cad7977693b695d138187c92f215e0 SHA-1: 164dd2169752781dd35d5816d3c3b7e891abe398 SHA-256: 93fc24573bd563f08b3a6a71276bfe085488d3bbb8d79bbbc3a75e5c0497e915

196 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript streams and an embedded file named 'dew008.docx'. The heuristics indicate the use of JavaScript actions and ASCIIHexDecode filters, suggesting an attempt to obfuscate malicious code. The embedded JavaScript is likely responsible for executing the embedded file, which is a common technique for delivering secondary payloads.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

OOXML OLE2Link remote document — CVE-2017-8759 related high CVE related CVE_2017_8759_RELATED

PDF auto-exports an embedded OOXML document containing an o:OLEObject Type=Link whose external oleObject relationship fetches a remote Office-looking document.
JavaScript action low 2 related findings PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
exportDataObject + nLaunch — embedded-file launch-on-open dropper critical PDF_JS_EXPORT_LAUNCH_DROPPER

PDF JavaScript calls exportDataObject() with nLaunch set, which extracts the document's embedded file and launches it in its default application. This is a launch-on-open dropper: the embedded file is the payload. No benign workflow auto-launches an extracted PDF attachment.
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.
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
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.
Embedded file low PDF_EMBEDDED

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

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL https://idontknow.moe/files/ptceg.doc In PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`dew008.docx`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x388	10113 bytes
SHA-256: `ee26067e5e475d8a813ad703f6c0ed36494fbfbe09c4380728530cd66f1d4337`
Detection ClamAV: No threats found Obfuscation or payload: likely actual_type=ZIP; declared_or_context_type=PDF; filename=dew008.docx; kind=pdf-embedded-file
`javascript_obj0009_000.js`	pdf-javascript-stream	PDF /JS object 9 at offset 0x7A17	60 bytes
SHA-256: `dd72e64c1024abb426436874c8a576e48eb9432e9fb3297dcc868997ddc9689f`
Preview script First 1,000 lines of the extracted script this.exportDataObject({ cName: "dew008.docx", nLaunch: 2 });
`javascript_obj0009_001.js`	pdf-javascript-stream	PDF /JS object 9 at offset 0x7A17	58 bytes
SHA-256: `7c9f2ac53b56d618ee015cb254ccbddf54994f4bae81c66c67ea92aa08a89062`
Preview script First 1,000 lines of the extracted script this.exportDataObject({ cName: "dew008.docx", nLaunch: 2 }
`combined_document_js_000.js`	deobfuscated-js	combined document JavaScript streams at offset 0x7A17	119 bytes
SHA-256: `b4f17e46f82db9f20653e6535b6672481c3a133ab4df7fe9def21e10595cf530`
Preview script First 1,000 lines of the extracted script this.exportDataObject({ cName: "dew008.docx", nLaunch: 2 }); this.exportDataObject({ cName: "dew008.docx", nLaunch: 2 }

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