PDF malware analysis — malicious · f8a44476a852444a

MALICIOUS

PDF

7.3 KB

MD5: 0f372300a4c0d4f905c0548d93420e97 SHA-1: b1158844892662ad11e351b24887b5fbccf1d6b8 SHA-256: f8a44476a852444a34e7450271332d8caaa7377a6150e64013a7d242dce7c500

266 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF document contains multiple critical heuristic firings related to known exploits (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) which leverage embedded and obfuscated JavaScript. The extracted JavaScript streams, particularly legacy_pdfkit_stage_000.js, are indicative of a downloader or exploit loader. ClamAV detection of Js.Exploit.Shellcode-18 further supports the malicious nature of the embedded script, suggesting it attempts to execute shellcode. The primary attack pattern involves exploiting PDF vulnerabilities to deliver a malicious payload.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0039_000.js` `afb325574d998eacc86d647317ef21e9f36fbf3f039b2395ab0b07bb41e01942`	pdf-javascript-stream	PDF /JS object 39 at offset 0x16F	27261 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` `7b037fa54190e770de0dcf95257be25307cfa7f02f349897a3cc5594440f0b09`	deobfuscated-js	numeric array XOR decoded JavaScript at offset 0x16F	5326 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).

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