PDF malware analysis — malicious · d324f57d53a6ca8d

MALICIOUS

PDF

8.9 KB Created: 2009-11-08 19:41:74 Authoring application: PDF Library 10.3.4 (via PDF Library 7.4.1)

MD5: 3cf39df81b81cf2304424d7a03a2cce4 SHA-1: b2353987b7000b9262966cf095d1666ad9e287a3 SHA-256: d324f57d53a6ca8d08eabbc31a7f8099236c33717d8ce66792702b5a2cabc28d

278 Risk Score

Malware Insights

The PDF file exploits multiple Adobe Reader vulnerabilities, specifically CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, through embedded and obfuscated JavaScript. The critical heuristics indicate that this JavaScript is designed to download and execute a second-stage payload, as evidenced by the ClamAV detection of 'Js.Exploit.Shellcode-18' on an extracted artifact.

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.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `da6c56c44c80739c06faa28a4b5309d7b60ae07bcb6fca4490bf055e6acc39bf`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	38197 bytes
`legacy_pdfkit_stage_000.js` `5bf2df6480783ecde8c9b73bb3231afb6e817d51f3b7e225cf9dc459e61a1554`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x268	9874 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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