PDF malware analysis — malicious · 7513ef81cd777a11

MALICIOUS

PDF

25.8 KB

MD5: c311ce69fe0072bdb184106dd10c7ab0 SHA-1: 597ecd8cc6d7a3fd4ff587fae76a96eb2bc4820d SHA-256: 7513ef81cd777a1161c7bb9dae3acb414c41d71ca215c33f3440dd35d60ec360

256 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that utilizes the `exportDataObject` and `nLaunch` functions to automatically launch an embedded document named 'pdoc.doc'. Heuristics and ClamAV detection strongly indicate exploitation of CVE-2017-11882, a vulnerability in the Microsoft Office Equation Editor, which is commonly used to deliver second-stage payloads. The embedded artifact 'pdoc.doc' is also flagged by ClamAV with a signature related to this exploit.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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.
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
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.
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
Suspicious extracted artifact info 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.

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`pdoc.doc` `0f2d8e35480cedfb9131461352e2c5f9ed3241f4832621ec54519c86c9dd0d9e`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x387	8344 bytes
Detection ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0009_000.js` `ad331a213418b29bab99ee2b1c7f19d5f6a516a4211d51b85f67bee91f948c8c`	pdf-javascript-stream	PDF /JS object 9 at offset 0x6586	57 bytes
`javascript_obj0009_001.js` `cad53703893c9eac8f9d19f47ee65ff1998b329a725eb2992661f7f472b4a4bc`	pdf-javascript-stream	PDF /JS object 9 at offset 0x6586	55 bytes
`combined_document_js_000.js` `58d51a49deb53d6f2598cf4466696299951807d54ca36f93822f60c45057e034`	deobfuscated-js	combined document JavaScript streams at offset 0x6586	113 bytes

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