PDF malware analysis — malicious · 841e31f8dce64291

MALICIOUS

PDF

174.6 KB

MD5: bfd8c2d6dbadd109c08fada0995c3d6b SHA-1: e7d4ef9cba18ecb6b9badf3e5f8952de759e14d7 SHA-256: 841e31f8dce642910fb3cc5917c6397e785741a9aab85df502d06413fce2eb7f

318 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript that exploits multiple known vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The deobfuscated JavaScript, named 'legacy_pdfkit_stage_000.js', is indicative of a multi-stage attack. The primary function of the embedded script appears to be the exploitation of these vulnerabilities to download and execute a secondary payload, as suggested by the ClamAV detections on extracted artifacts.

Heuristics 8

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-35932 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35932
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` `070eb47b6e125b46571366c9cca7cfd1a3df2bbce355bc78014c30ce1be18bf9`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3903 bytes
Detection ClamAV: Pdf.Exploit.Agent-36307 Obfuscation or payload: unlikely
`legacy_pdfkit_stage_000.js` `cc2c9919f727926d54de2e82846e64cf781fb004557fa11f30f1cd61fe1d7e94`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x115A	8288 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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