Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd0c0bcc17b9f08…

MALICIOUS

PDF

12.1 KB Created: 2009-12-16 19:46:29 Authoring application: PDF Library 9.3.7 (via PDF Library 2.7.6)
MD5: 644371815d8dbd85789acb1b6d20564a SHA-1: 813b477eca9172ab9677103c845e353229b3d235 SHA-256: 7fd0c0bcc17b9f08dbc2c4e3b9b43075cde5bfc70b5cdea279b280eb91e59207
278 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link T1059.007 JavaScript

The PDF exploits CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 using embedded and obfuscated JavaScript. Static analysis recovered a deobfuscated JavaScript file indicating it's designed to download and execute a second-stage payload, as detected by ClamAV signature Js.Exploit.Shellcode-18. The use of multiple CVEs suggests a multi-stage exploit kit.

Heuristics 8

  • 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.
  • 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
e2a9b2eff206284a8a7208026558c31383d81f5b5922691e85501d9f070688b7		 pdf-javascript-stream PDF /JS object 7 at offset 0x268 38140 bytes
legacy_pdfkit_stage_000.js
39a2a00f5fc1f7aed5d99b5c450a588ae78e23b3a6a62fec384fed4a7b32801f		 deobfuscated-js numeric array subtract-key decoded JavaScript at offset 0x268 9880 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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