PDF / .TXT malware analysis — malicious · cac809d8aa14c30d

MALICIOUS

PDF / .TXT

5.8 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe (via Notepad)

MD5: 12bf516e1e6a9bf209ffc5d4cb2709cc SHA-1: d838e586f43deada9051832161d2b8817d0cb293 SHA-256: cac809d8aa14c30dc060c53f9406943f18f6e75276c26f0e8163457866484dab

358 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF exploits multiple Adobe Acrobat vulnerabilities, specifically CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, by leveraging embedded JavaScript. The embedded JavaScript streams, identified as legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js, are deobfuscated and likely contain shellcode or further malicious payloads. ClamAV detections further confirm 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-35931 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35931
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `c8d23374662750f467daeb1c0ca4fa3381d381e03f0785d2962e7fe6346e84aa`	pdf-javascript-stream	PDF /JS object 6 at offset 0x134A	1031 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `2589e72f0922d05e81f24a0bf4af712e63d74a0ef804ee5c50e8fd90f9bd85dd`	deobfuscated-js	metadata placeholder percent-decoded JavaScript at offset 0x16E	4899 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `00d3ec8a284d5f9415e827e2a5a9750032a425d5549c0713f397880924900273`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x16E	4895 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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