Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fce24f2e1769496…

MALICIOUS

PDF

45.8 KB
MD5: d1af5d25343e6cdf71ab407d1e7b3719 SHA-1: e67d316b6f80c175c4ef86b3af0ca5625ae28deb SHA-256: 5fce24f2e1769496a2b4f0c7cecaf55a277da45207b70172bf541319b5ec40dc
170 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2009-0927 (Collab.getIcon) in Adobe Reader. The script decodes a second-stage payload and attempts to download it from the URL http://dglan.ru/fm5ruk4llLNoeI1UkFtBgCfeKz826aua?p=1&x=945&s=oldpdf. This indicates a clear intent to execute arbitrary code from a remote source.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
  • 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.
  • 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://dglan.ru/fm5ruk4llLNoeI1UkFtBgCfeKz826aua?p=1&x=945&s=oldpdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
5eccc0a2a450125e547644a25f3b71b614cb6505539272869ff15208e7284f2b		 pdf-javascript-stream PDF /JS object 8 at offset 0x1D3 9215 bytes
custom_b64_stage_000.js
dcdf36e6359408ceb8b4737991ac6b6f96592aff7c85de850340a9d9e4e2011d		 deobfuscated-js custom Base64 decoded JavaScript layer 2 (PDF /JS object 8) at offset 0x8A7 1517 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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