PDF malware analysis — malicious · 1bc11d774993159f

MALICIOUS

PDF

5.9 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe

MD5: 03ed9d0cf1829838b74ef0f1de2c7b43 SHA-1: 1bf22c72e5a2b91f5f3da33631ebbe7d9da79b70 SHA-256: 1bc11d774993159fb1e2372f74fdbb11d7ccfe2695044f295bf6f93c420e77ce

198 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1059.001 Command and Scripting Interpreter: JavaScript

The PDF file contains embedded JavaScript that exploits known vulnerabilities (CVE-2009-0927 and CVE-2007-5659) in Adobe Reader. The heuristic firings and the ClamAV detection of 'Js.Exploit.Shellcode-18' indicate that the JavaScript is designed to download and execute a secondary payload. The deobfuscated JavaScript found in 'legacy_pdfkit_stage_000.js' confirms this malicious intent.

Heuristics 6

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `cafa58c7bc9886f3b63a6e257a5f39adffb879a1d83005837b1ec69e33053b5c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x13C5	121 bytes
`javascript_obj0016_001.js` `2296f276a6200e1ed6623c5f9080dc121966d470671a6f572554c37def04ac83`	pdf-javascript-stream	PDF /JS object 16 at offset 0x1484	140 bytes
`legacy_pdfkit_stage_000.js` `a0eaebd0010d2ba4868e2d38b8af7abf7383fdb6faf735d32404eee6a92a0560`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1E7	4895 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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