PDF malware analysis — malicious · b2ad6f01227e47a9

MALICIOUS

PDF

135.1 KB

MD5: a68ff5fdd92f50c16729fc9ef0599786 SHA-1: bcdf789bd3a467998a6d0bb353b491b561b3d149 SHA-256: b2ad6f01227e47a90300277d78cc4425950412e30749064bdbc327449a4f4b7f

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The sample is a PDF file that contains embedded JavaScript, triggering multiple critical heuristics related to known PDF exploits (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992). An extracted JavaScript file, 'legacy_pdfkit_stage_000.js', was also flagged as suspicious by ClamAV with the signature 'Js.Exploit.Shellcode-18'. The obfuscated JavaScript in the DOC BODY section, combined with the exploit heuristics, strongly suggests the document's purpose is to leverage these vulnerabilities to download and execute a secondary payload.

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` `7f811bc2453305229067151e2d9b64aaa253af3e6ed647857a54c1fd312a9f8f`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2105 bytes
`legacy_pdfkit_stage_000.js` `ec1ae9941da3ed7276544a499e9151201c3dd94a12eb9234264f7360a46e9d35`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xA54	9024 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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