PDF malware analysis — malicious · d18b65b2145c7468

MALICIOUS

PDF

5.7 KB Created: e1svrt Authoring application: Adsfgddfobe (via sfgasdfgsd)

MD5: 554a5e52d0f4e1b34d902465567507c9 SHA-1: 3098af8a892ebc1c5a1acad238246eafdfab4d3f SHA-256: d18b65b2145c74680b6c20a425ea144297fcb01904d5fdffe3ddc2dddde52c0f

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link 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', is heavily obfuscated but detected by ClamAV as 'Js.Exploit.Shellcode-18', suggesting it's a malicious exploit script. The primary function of this script appears to be downloading and executing a second-stage payload, as indicated by the exploit signatures and the nature of the vulnerabilities targeted.

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_obj0006_000.js` `4dea2fb1af8ab7a2103daa90b7825d11080721c99ce1eac7eec5d2cfe4d74773`	pdf-javascript-stream	PDF /JS object 6 at offset 0x14A	415 bytes
`legacy_pdfkit_stage_000.js` `f5b40dd92ce132ad19106b260284ac72acf31c244775235b3e10de0d7b2ef14c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E7	11362 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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