PDF malware analysis — malicious · 2b1758ab9ed4fa62

MALICIOUS

PDF

20.0 KB Created: 2007-12-34 66:15:26 Authoring application: Adobe

MD5: 16f1ed838144cc65852d8f3765a673e7 SHA-1: f7a5148ff86cdcba18765752d811ece5ac97ed11 SHA-256: 2b1758ab9ed4fa6292a6cb44794175e62e521fab79c92c592e4a6d33d8ac4129

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF document leverages several critical vulnerabilities including CVE-2009-4324 (media.newPlayer), CVE-2009-0927 (Collab.getIcon), and CVE-2007-5659 (Collab.collectEmailInfo). These exploits facilitate the execution of obfuscated JavaScript, which is further processed using eval() and unescape() functions. The embedded JavaScript, detected by ClamAV as Js.Exploit.Shellcode-18, is designed to download and execute a second-stage payload. The specific vulnerabilities exploited suggest a targeted attack aimed at older PDF reader versions.

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_obj0032_000.js` `77f3d4c68ccfd4657035ac2ca4248fd70bbccdfe3e25e3dc86a3505ad6e330f2`	pdf-javascript-stream	PDF /JS object 32 at offset 0x394	129 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0532_001.js` `902259d4af209bbcc4e92a02072292eaa0b16d76c9a18592441fcd9d71d32a70`	pdf-javascript-stream	PDF /JS object 532 at offset 0x297	192 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `db81bdc27ffafe4d8dcf4ede0c15bd5f2cc4a6a5ccce2e45624baf4481fba542`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x44C	3244 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `c6ab458a3c41b3a49a74bc2434e8c0b842e47ae2fba9ed2e78bba1a76caaa39a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2A81	3045 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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