PDF malware analysis — malicious · 3e4ab63c24d965d4

MALICIOUS

PDF

135.6 KB

MD5: 875ae15817f7e7ff643db733ee91fac5 SHA-1: 633d9d6a60b33dfd9b0146b1a8440561e6345ecf SHA-256: 3e4ab63c24d965d42ce6cb71efd58f7f32cd9c4dcf29214cf31de22305281f1f

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The sample is a PDF file that leverages multiple critical vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) by embedding and executing JavaScript. The embedded JavaScript, identified as 'legacy_pdfkit_stage_000.js', is heavily obfuscated but detected by ClamAV as 'Js.Exploit.Shellcode-18'. This indicates the script's purpose is to download and execute a malicious payload. The attack pattern is consistent with PDF-based exploit kits designed to compromise the user's system.

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` `0866dd225f2fb1b69eb81aeda4a8d4583880427b143db16aba36145ed6e8335e`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2089 bytes
`legacy_pdfkit_stage_000.js` `6517402803d4b2fad14a6daaf686ed7b7fe16a1ecb6c78385fc64301f0318881`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xA44	9060 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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