Malicious PDF — malware analysis report

Static analysis result for SHA-256 6877f6bd654c9aa4…

MALICIOUS

PDF

6.1 KB
MD5: e2659d23ce309f1ba0ddf1b75452dcd7 SHA-1: 1985f54f02257f126421ce6f03bd8ed929120786 SHA-256: 6877f6bd654c9aa48f6685c38f7e77c4bd4751763554eea518722ff1dc0fa112
148 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS_EXPLOIT_CLUSTER. The presence of PDF_UNESCAPE suggests the JavaScript is obfuscated and likely malicious. The ML classifier also flagged the PDF as malicious with a high score. The JavaScript's purpose is inferred to be the download and execution of a secondary payload, a common technique for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

Heuristics 5

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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 http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0023_00.bin
b6059ba515e20332791ce6a7652164e7a67c8197c56dc71f2fecb0005e4a496f		 pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 526 bytes

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