PDF malware analysis — malicious · ebb684819b838aea

MALICIOUS

PDF

132.8 KB

MD5: 9c98fb9299ac93f59829204bc531def2 SHA-1: 2d54ef5a374a453d24a810c1f4b4dd8bba9f3ea7 SHA-256: ebb684819b838aeae44c0720c67f4457ae788e31c8891153f777a8fc4d4318b9

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/URL

This PDF file contains embedded JavaScript that exploits multiple Adobe Reader vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The heuristics indicate that the JavaScript is obfuscated and designed to be evaluated after concatenation of PDF info fields. The extracted artifact 'legacy_pdfkit_stage_000.js' was flagged by ClamAV as Js.Exploit.Shellcode-18, suggesting it's a shellcode loader. The primary intent appears to be downloading and executing 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` `ade60b3ec34f0343bbe40f2e6960ae31df55f7106b868882d810bb3fe880484a`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2095 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `417d00a056beead23da3610f15d42608d18253c52e45b72a1d9a02e25a0bf5fe`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xA4A	14781 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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