PDF malware analysis — malicious · 2915458ba44f627b

MALICIOUS

PDF

135.6 KB

MD5: b2234210ce9c7bb8d70327fcac5b24e9 SHA-1: 209238887e7082e2917bcd1ff0b2b7990a5d6e73 SHA-256: 2915458ba44f627bfea2c5ffadf474588fb9b12bffb17d52b543babea83515f5

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The sample is a PDF file that contains embedded JavaScript. Heuristics indicate exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, which are known vulnerabilities in PDF parsers related to JavaScript execution. The embedded JavaScript, identified as 'legacy_pdfkit_stage_000.js', is likely responsible for downloading and executing a secondary payload, as suggested by the ClamAV detection 'Js.Exploit.Shellcode-18'. The obfuscated JavaScript and the use of known exploits point towards a malicious downloader.

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` `7b61c6bc65ba4cbde52aff01f617eaa27a6d1dd8dbb68a81c75c5ad92305a1a1`	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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