PDF malware analysis — malicious · a4ac4c2571f59bdb

MALICIOUS

PDF

325.2 KB

MD5: 0978921c79a50b27f70d9890a7fa3d60 SHA-1: 8f7f395f6af58e0146878078e1fa169951c7ddb6 SHA-256: a4ac4c2571f59bdb0964b861ee0deb52c4c8337a68c202f9fef22c39e8ef9d96

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF document exploits multiple critical vulnerabilities including CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 by executing embedded and obfuscated JavaScript. The embedded JavaScript, identified as legacy_pdfkit_stage_000.js, is likely responsible for downloading and executing a second-stage payload, as indicated by the ClamAV detection 'Js.Exploit.Shellcode-18' on an extracted artifact. The attack pattern involves luring the user into opening a malicious PDF that leverages these known exploits.

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` `74785b9ba7adfbb28e8139ef78af78167ae359b1e51e6cca816ba32495e30759`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3766 bytes
`legacy_pdfkit_stage_000.js` `68a58fa2007b48353adfdc9673bbc3f279fec2a3a663fb4b4b50c8f600b89781`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x10D1	10946 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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