Malicious PDF / .CHK — malware analysis report

Static analysis result for SHA-256 6d55b31a1cb14b6f…

MALICIOUS

PDF / .CHK

253.6 KB
MD5: 11e6e22cb05bd0f1c871f15c387cf412 SHA-1: 2018c668a6ab5718a76ac71da1e2a6365be1aa29 SHA-256: 6d55b31a1cb14b6f0f46c0021da187182b24018e7df69185be409e7c28e3633a
118 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded JavaScript and a Flash object (kpnc.swf), indicating an attempt to exploit vulnerabilities for client execution. The embedded Flash file is likely a second-stage payload. The presence of PDF-specific exploit indicators and ML classification further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • 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.
  • 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.loud.com.au
    • http://www.amnesia.com.au
    • http://games.amnesia.com.au/highscores/ing/enter_player.cfm?player_fname=
    • http://www.ing.com.au

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
kpnc.swf
b8e01434278cb1c8b7b8b2728b9d23de50b633da0f88d9d19a512f456758877b		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x428 258225 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.52, consistent with packed or encrypted content.

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