Malicious PDF — malware analysis report

Static analysis result for SHA-256 836ffa7b7346e2f0…

MALICIOUS

PDF

2.6 KB
MD5: dd2767a7d1ef209cd3697fa98ef3f73a SHA-1: 682c2b38600a1e437214a94420dfd628cf22eea5 SHA-256: 836ffa7b7346e2f076a1dc69328917b8ecbd775c4b70c1d70b971025b6783700
170 Risk Score

Malware Insights

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

The sample is a PDF file that exploits CVE-2010-0188, a known vulnerability in Adobe Reader related to LibTIFF XFA image handling. The embedded JavaScript attempts to download a file named 'update.exe' from 'http://www.brenk.strategyobject.com/download_file.php?e=Adobe-80-2010-0188' using the 'urlmon.dll' library, indicating it's a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188
    PDF contains XFA image data with an inline crafted TIFF payload and shellcode/delivery markers. This is the data-bound variant of the CVE-2010-0188 Adobe Reader LibTIFF/XFA exploit shape.
  • ClamAV: Pdf.Exploit.Dropped-90 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-90
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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.brenk.strategyobject.com/download_file.php?e=Adobe-80-2010-0188��
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.4/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
a9fe0f82e72afc42fd601a260029be5ca0b83ecc50089337607c41ad174ee816		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x5D 13473 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
acroform_b64_00.js
5a085d8b9213c82405024d5290f0f63e0e29ae9ccf8757c43c33c5afaff72f1a		 deobfuscated-js PDF AcroForm base64 (decompressed) at offset 0x58A 8730 bytes

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