PDF malware analysis — malicious · dfaa0fd25f4e6ba3

MALICIOUS

PDF

11.9 KB Created: 2009-12-18 19:42:63 Authoring application: PDF Library 7.2.7 (via PDF Library 10.2.8)

MD5: 4ddcb2252e14224f27f421284de3489a SHA-1: b2e9d1dba3dd66443b447d51ed257affa1b25d92 SHA-256: dfaa0fd25f4e6ba37950181ff4199f31d295c962835c313f44dc5c3cd47351bf

278 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF exploits CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 using embedded JavaScript. Static analysis identified a deobfuscated JavaScript file ('legacy_pdfkit_stage_000.js') which was flagged by ClamAV as 'Js.Exploit.Shellcode-18'. This indicates the script is designed to download and execute a secondary malicious payload.

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` `a142a2d54a4be6cd2bff16440d446fb73bc0f54aebff1c6ac2d8c525e91a18c6`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	37095 bytes
`legacy_pdfkit_stage_000.js` `5cf956c55adb9c18234dd9a1027ad7dd7f5958c5a278fe68e6fca217b124fc35`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x268	9868 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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