Malicious PDF — malware analysis report

Static analysis result for SHA-256 054db39e2f48604f…

MALICIOUS

PDF

30.9 KB
MD5: 30fb1a78960e545e1b339a3665979341 SHA-1: 39075aaadd91ff097098325e26c4b9cf4864efea SHA-256: 054db39e2f48604f59378ea33b53b32f6b86e846d0e85456b4d757123da10152
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains JavaScript that utilizes `exportDataObject` and `nLaunch` to automatically open an embedded OOXML document named 'dew008.docx'. This behavior is indicative of a dropper, designed to execute a secondary payload. The embedded document is linked to CVE-2017-8759 and points to a suspicious URL, further supporting its malicious intent.

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.
  • 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: Pdf.Dropper.Agent-7224157-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7224157-0
  • 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
  • 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/ykluhp.doc

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
dew008.docx
720144fa749a9c7f1bbaac9be7896dbdba109d8df4d16e6a951735615b2ed113		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x388 10092 bytes
javascript_obj0009_000.js
dd72e64c1024abb426436874c8a576e48eb9432e9fb3297dcc868997ddc9689f		 pdf-javascript-stream PDF /JS object 9 at offset 0x79D0 60 bytes
javascript_obj0009_001.js
7c9f2ac53b56d618ee015cb254ccbddf54994f4bae81c66c67ea92aa08a89062		 pdf-javascript-stream PDF /JS object 9 at offset 0x79D0 58 bytes
combined_document_js_000.js
b4f17e46f82db9f20653e6535b6672481c3a133ab4df7fe9def21e10595cf530		 deobfuscated-js combined document JavaScript streams at offset 0x79D0 119 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.