PDF malware analysis — malicious · cfc49bd13d1905cc

MALICIOUS

PDF

135.6 KB

MD5: c8152806d6ba53c9528d1f6a9a16bf68 SHA-1: 9e9f2b2e64f78a56763e76ee4d47d91e045234f4 SHA-256: cfc49bd13d1905cc112df0d20baf5448e998126b3f45da11318f5254dd8793d9

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1027 Obfuscated Files or Information

The PDF exploits multiple CVEs related to JavaScript execution within PDF documents. The embedded JavaScript is heavily obfuscated, as indicated by the 'Script obfuscation indicators' signal and the 'legacy_pdfkit_stage_000.js' filename. The ClamAV detection 'Js.Exploit.Shellcode-18' further confirms the malicious nature of the script. The script likely downloads and executes a second-stage payload, although the exact mechanism is obscured.

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` `dc06e0d33acb651deb9e6082799968340a2f1dab2f4432d37be184c83397e9f7`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2105 bytes
`legacy_pdfkit_stage_000.js` `6517402803d4b2fad14a6daaf686ed7b7fe16a1ecb6c78385fc64301f0318881`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xA54	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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