Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5caebf0833b27a1…

MALICIOUS

PDF

325.2 KB
MD5: bd8916ab1364e5d77e95bfd96b8258ae SHA-1: c38c0cb1129157a4797685041c0af53dafa9c0f4 SHA-256: c5caebf0833b27a138b41b7fe8b5fec193de493ae9565428db6ae4bba9f13d73
258 Risk Score

Malware Insights

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

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 through embedded JavaScript. The deobfuscated JavaScript stream, legacy_pdfkit_stage_000.js, was flagged by ClamAV as Js.Exploit.Shellcode-18, suggesting it attempts to download and execute a secondary payload. The DOC BODY content is heavily obfuscated and does not provide clear user-facing text, but the technical indicators strongly point to a malicious exploit delivery.

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
b64e700f24912a398fea5246b82bf4e211f6f4e3d2edfe6e2ba2096de7130f44		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 3766 bytes
legacy_pdfkit_stage_000.js
c19eaae28e0792cf1bac400453e3d6e19b28f88815b42428d281a24e0b36cce4		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x10D1 10946 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s).

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