PDF malware analysis — malicious · 510a7d02c718ef0a

MALICIOUS

PDF

250.1 KB

MD5: bb9fc93133334f4b6a5271ee3f14ecf5 SHA-1: d4667fa1c323ee95d483695e8eb26aa226f4ee7e SHA-256: 510a7d02c718ef0a59ef4c3922c29fee76b51ae2132d4d73cf7e9889bce36c87

258 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF document leverages multiple critical vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) by embedding and executing obfuscated JavaScript. The embedded JavaScript, identified as 'legacy_pdfkit_stage_000.js', was detected by ClamAV with the signature 'Js.Exploit.Shellcode-18', indicating it likely contains shellcode. The script's purpose is to download and execute a second-stage payload, which is a common technique for initial access and further system compromise. The attack pattern is consistent with a malicious PDF designed to exploit reader vulnerabilities.

Heuristics 7

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.
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_obj0008_000.js` `f6379c972f966ea3189aeae284636a6a9af2ebd3883b66f5d7ff0d3d78e972d1`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3415 bytes
`legacy_pdfkit_stage_000.js` `1b9d3cf0c122776e110e01f5f0dbdd5be0d02cd423294aac93d8acd0a45ac15c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xF72	8394 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).

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