PDF malware analysis — malicious · 88b49c7dabeb6062

MALICIOUS

PDF

180.5 KB

MD5: 2859e5f2d051f93fd3714c641a96fe46 SHA-1: 2767ed457b4e9dd6a1fac593885bebeb91d95475 SHA-256: 88b49c7dabeb6062703aca3fe89596ecda3c9e083d6b97c81c0f779c778a23fe

318 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

The PDF file contains multiple critical heuristic firings indicating exploitation of known Adobe Reader vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) via embedded JavaScript. The embedded JavaScript streams, identified as 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', are likely responsible for downloading and executing a secondary payload from the embedded URL http://taifirst.co.cc/t-boz-and-chilli.html. ClamAV detections further corroborate the malicious nature of the file and its extracted artifacts.

Heuristics 9

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: Pdf.Exploit.Agent-36114 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36114
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://taifirst.co.cc/t-boz-and-chilli.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `bc6f7a34a314f0d12f9e954a25f2b77f0455f64994f80789483959f74abe75ea`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2687 bytes
Detection ClamAV: Pdf.Exploit.Agent-36307 Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `14486b3bac46325d78db2d7ccfefb0e5b3cfcbf0d8a3954d4187944ec3db6860`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xC9A	12718 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `0a7c4af7129c0c52cbbbef74b18309f418a8df713f2b2bf1162e946ece0dfe90`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0xC9A	20043 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).

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