PDF malware analysis — malicious · a1c99bc02a4fdbfd

MALICIOUS

PDF

135.1 KB

MD5: a59bf823f3aa0800e21049f3be618276 SHA-1: f8c0ad533a248eb058634daf18a5f8c4e664073e SHA-256: a1c99bc02a4fdbfdf873e0e8aa9f3d271f57457cf862525247cf2ca81d1cac9a

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The sample is a PDF file that leverages multiple critical vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) by executing obfuscated JavaScript. This JavaScript is embedded within the PDF and is further deobfuscated into a file named 'legacy_pdfkit_stage_000.js'. The ClamAV detection 'Js.Exploit.Shellcode-18' on an extracted artifact indicates the presence of malicious shellcode. The overall intent appears to be the download and execution of a second-stage 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` `dd16333793762feb39970d9b663126a2758afdb88e496816b2aecd31ad70bde8`	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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