PDF malware analysis — malicious · 420adf76867989e5

MALICIOUS

PDF

164.0 KB

MD5: f6ede08f98c7fa418a1edd619f0d3b42 SHA-1: 2ffb50a563ad7d12f4a9306d8f05cc3b53a62b57 SHA-256: 420adf76867989e517131b5699b2d8e66162fc8aa0345de9fcd9f4d2c285d0a5

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF document exploits multiple known vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 by leveraging embedded JavaScript. The embedded JavaScript, identified as 'legacy_pdfkit_stage_000.js', is heavily obfuscated but detected by ClamAV as 'Js.Exploit.Shellcode-18'. The primary function of the script appears to be downloading and executing a secondary payload, indicated by the heuristic firings and the nature of the exploit techniques used. The exact URL for the second-stage payload could not be reconstructed due to obfuscation.

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` `f5eed14559e347c7a4bb0ca4cc1eefb2e7e0277c38114302daa068d7b8ba7e74`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3145 bytes
`legacy_pdfkit_stage_000.js` `587d0c9d579317528c1109cf0168a5981f11d9a187947fad24ba385d167a13aa`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xE64	10928 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).

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