Malicious PDF — malware analysis report

Static analysis result for SHA-256 c753a994c2842a8c…

MALICIOUS

PDF

135.1 KB
MD5: ab7c3706e2d1960f1b1a94526dd0460b SHA-1: ace51a49256c4c870f88721fcdc14082bfb745d6 SHA-256: c753a994c2842a8c41e4ad7c21a9be08a8c29122edd3e94e9dc4b113f8be6679
258 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript T1204.002 Malicious File

The sample is a PDF file that leverages multiple critical vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) by executing obfuscated JavaScript. This JavaScript is likely designed to download and execute a secondary payload, as indicated by the ClamAV detection 'Js.Exploit.Shellcode-18' on an extracted artifact. The embedded JavaScript is heavily obfuscated, making precise analysis of its final actions difficult, but the exploit chain points towards a downloader or initial access mechanism.

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)
  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
ea1735aed9d70a6e52021bdd42f41e9b09b6995f8a567a7d50257057c7caca3f		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2105 bytes
legacy_pdfkit_stage_000.js
ec1ae9941da3ed7276544a499e9151201c3dd94a12eb9234264f7360a46e9d35		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xA54 9024 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 9 eval/decoder/string-building token(s).

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