PDF malware analysis — malicious · f4e39cbb2a3ff573

MALICIOUS

PDF

69.6 KB

MD5: 94047fc980fe965cb1ca990a6c4881d1 SHA-1: 5a6a30d2a7fb3701bc04e302d17fee4e4936cd8d SHA-256: f4e39cbb2a3ff573d8a1d6e299a8b84464810159903bc984c6a8a8c09056abf5

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 through embedded JavaScript. The extracted JavaScript, identified as legacy_pdfkit_stage_000.js, is heavily obfuscated but the ClamAV signature Js.Exploit.Shellcode-18 suggests it contains malicious shellcode. The document body contains obfuscated JavaScript intended to be evaluated, further supporting the exploit execution.

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` `afa01587b50cacb2257d44195a24896aec8a59a020d72c2c02666b2e13ff0f13`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2089 bytes
`legacy_pdfkit_stage_000.js` `045518b5d2528577a99478a4ee42221cb398fddde352f769a61e51f91dc8c1d3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xA44	4560 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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