PDF / .SWA malware analysis — malicious · b90d49e6b9db9722

MALICIOUS

PDF / .SWA

6.7 KB

MD5: 8b58176035dec2e5cbefbc07f8d6d393 SHA-1: 91d9797640b31af429427cb8abbbd8960f5937af SHA-256: b90d49e6b9db97222fcf7f4334406a9f93ef6f7c401c7c36655a138515192426

266 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 through embedded and XOR-decoded JavaScript. The extracted JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', are flagged by ClamAV as 'Js.Exploit.Shellcode-18', suggesting it attempts to download and execute a second-stage payload. The obfuscated nature of the JavaScript and the use of known PDF exploits point towards a downloader or dropper functionality.

Heuristics 8

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.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0039_000.js` `696933d7f15edb174590077f9ccf801931ffc7110346ee0638809f0ba25c0656`	pdf-javascript-stream	PDF /JS object 39 at offset 0x16F	20292 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` `457f8cc02f68e0d08b6fdee2fae5ac8f947fbeccd971d0a31bd950c1d4ceac16`	deobfuscated-js	numeric array XOR decoded JavaScript at offset 0x16F	5434 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `3f2690fa58391b922f5854d4bd2dcb51e752b33a499a07c54fdbcb9747cbc7e8`	deobfuscated-js	numPages XOR decoded JavaScript at offset 0x16F	5434 bytes

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