PDF malware analysis — malicious · de05652f88638e0a

MALICIOUS

PDF

4.9 KB Created: 2010-03-14 11:38:02 Authoring application: zwa6c88

MD5: 7d6ae1f45bbf91cd0f87397360af4436 SHA-1: d560cad3bc20b15cb528eeced1fa7f6f4f5b1662 SHA-256: de05652f88638e0aee68bc0ff4332d562f253449b9b4c7afe036e58335a1561d

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/URL T1071.001 Web Protocols

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. These vulnerabilities are leveraged to execute embedded JavaScript. The extracted JavaScript, identified as 'legacy_pdfkit_stage_000.js' and flagged by ClamAV as 'Js.Exploit.Shellcode-18', strongly suggests the execution of a malicious payload. The script's purpose is likely to download and execute a second-stage payload from a remote source, a common technique for initial access.

Heuristics 7

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
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)
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_obj0028_000.js` `87e287327551e3569c835ee2330bbf60cdadd47419b48cafb994b207036bf26c`	pdf-javascript-stream	PDF /JS object 28 at offset 0x103D	307 bytes
`legacy_pdfkit_stage_000.js` `6b62b789ac7aeddecdd2a05c5ffb933ba8c46e6a4a5dbf6d496e7ceaeced6011`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1EC	7373 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 17 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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