PDF malware analysis — malicious · 58cdc67dbffb6d2d

MALICIOUS

PDF

4.2 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe

MD5: 33a4d8b492015891384d8be438d33d8b SHA-1: c116a404e1ab8dd85e1d746be304a73960f81245 SHA-256: 58cdc67dbffb6d2d29eb0f7ce4776e843f6ec3a886ca9e58db3c71d57abeec23

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. These vulnerabilities are leveraged to execute obfuscated JavaScript, which in turn is detected by ClamAV as Js.Exploit.Shellcode-18. The JavaScript likely downloads and executes a second-stage payload. The document body is heavily obfuscated and does not provide clear user-facing content.

Heuristics 9

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
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)
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)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `dca746c2eb38dbc714ed27e67de8af727bf6e0b0e60ed80f0edb62a93f37c55b`	pdf-javascript-stream	PDF /JS object 6 at offset 0xC4E	183 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0016_001.js` `71f214835727f046a2ff74b4bb64cbbd0119556b4f3685dfca093c3a23feb982`	pdf-javascript-stream	PDF /JS object 16 at offset 0xD1A	95 bytes
`javascript_obj0026_002.js` `34d42295b908ce056cb1d0e3cdc80c7143721e6103f6fc65e20f2402bce1aad4`	pdf-javascript-stream	PDF /JS object 26 at offset 0xDC4	135 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `1cd54eacbcd41eab1dcd6c15c079855903623143c4f7e5b7d08299be22f8785f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x205	6405 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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