Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bcc38652b979dd…

MALICIOUS

PDF

13.6 KB
MD5: 6f4bc8346babb2414065b21fefae2ba9 SHA-1: 5cd074efcdaec34a623c72e4a1d12e0608dbac17 SHA-256: 84bcc38652b979dd4957d6d8c0764d62cf42fe11411f1c8d4f9e2e858469eff5
216 Risk Score

Malware Insights

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

This PDF file contains obfuscated JavaScript and an embedded Flash file (kpnc.swf), strongly indicating malicious intent. The JavaScript is likely designed to exploit a vulnerability and execute the embedded Flash content, which in turn may download and execute further malicious code. The presence of obfuscated names and embedded files points towards a downloader or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 7

  • Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECT
    A PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • 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 http://adobe.com/AS3/2006/builtin

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
kpnc.swf
d649187d10bf6dee4a36e0b0a5af01520ac2dc24f43d0fc914f380472e9c3c82		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x63D 11885 bytes

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