PDF malware analysis — malicious · a5d936f66f4ad44e

MALICIOUS

PDF

12.1 KB Created: 2009-11-23 19:46:04 Authoring application: PDF Library 7.5.4 (via PDF Library 3.10.4)

MD5: 8f91b4d3a2cc249cde83fb9999e97db3 SHA-1: 8ee730d10f7c8f1af287054103ed9b1a9513778b SHA-256: a5d936f66f4ad44e4cc7866e3599c6ed4f6c15560f7978956b9a4959af50f719

278 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF document exploits multiple known vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) in Adobe PDF Reader. The embedded JavaScript, identified as legacy_pdfkit_stage_000.js, is responsible for triggering these exploits. The heuristic firings and the detection of 'Js.Exploit.Shellcode-18' on an extracted artifact indicate that the script likely downloads and executes a second-stage 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` `92bfb1bdae52749488fc3c2c1e6f020366c654474df259c7dbb9a903d3024141`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	37708 bytes
`legacy_pdfkit_stage_000.js` `723b5245825043ef2dd39ac39ed3bd3b90604d21844a7bd06eb29e8fc27a4d9d`	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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