PDF malware analysis — malicious · 7555d6820e484357

MALICIOUS

PDF

75.1 KB Created: 2009-12-02 19:45:92 Authoring application: PDF Library 7.3.4 (via PDF Library 6.10.5)

MD5: 4beebf840b18a7416d2055a2a74156db SHA-1: 9d7ecb5c584e34bbdd6f157f24699e02a6f01e47 SHA-256: 7555d6820e484357c8d8bdc97f265bc6c0691253b1b6bbd9c7f3589eb271fe18

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF exploits multiple known vulnerabilities in Adobe Acrobat, specifically targeting Collab.getIcon, Collab.collectEmailInfo, and util.printf functions. The embedded JavaScript, identified as 'legacy_pdfkit_stage_000.js', is heavily obfuscated and likely responsible for downloading and executing a second-stage payload. The ClamAV detection of 'Pdf.Exploit.Agent-36110' and 'Js.Exploit.Shellcode-18' further confirms the malicious nature of the embedded script.

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` `a101dd58bbe8f4a9efbab4c1d1ddf9cf8c5afb9fb01664fcbea48d7a1f5f0280`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	37929 bytes
`legacy_pdfkit_stage_000.js` `12adbb1562998b02606629a0f590567afc8191e904f60f68c6b102b852e020da`	deobfuscated-js	numeric array subtract-key decoded JavaScript at offset 0x1A5	9802 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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