PDF malware analysis — malicious · f19f22b89f416559

MALICIOUS

PDF

76.3 KB Created: 2009-12-01 19:45:10 Authoring application: PDF Library 3.10.1 (via PDF Library 3.5.1)

MD5: d56471a9199223bef9a4b502c2e3a89b SHA-1: f8ce01f64fb3742ee35c5271425a803a91f43499 SHA-256: f19f22b89f4165591a0b57e5b393ece2ac1d966e0159fc60e0d276e4b2d7766c

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

This PDF file contains multiple critical heuristic firings indicating exploitation of Adobe Acrobat vulnerabilities, specifically CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. These exploits target JavaScript execution within the PDF viewer. An embedded JavaScript file, 'legacy_pdfkit_stage_000.js', was deobfuscated and detected by ClamAV as 'Js.Exploit.Shellcode-18', suggesting it's a component of the exploit chain. The primary PDF itself was detected by ClamAV as 'Pdf.Exploit.Agent-36110'. The overall attack pattern involves leveraging these known vulnerabilities to achieve arbitrary code execution, likely for downloading and executing further malicious content.

Heuristics 9

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: Pdf.Exploit.Agent-36110 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36110
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` `da4e931f2d2fd000e7d84309275ef5cc9b65db98067446fcb4a65be9bfbb977a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	38558 bytes
`legacy_pdfkit_stage_000.js` `4cd3eff302cd477608cddfea6b4ddd5de6c0c7f4f4f16b079a735f0a5da05769`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x1A5	10114 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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