PDF malware analysis — malicious · 528fcfb0780c5939

MALICIOUS

PDF

92.6 KB

MD5: 7fb0f766b1c9142cde09e2ca94ded547 SHA-1: 4ecf6ba3b7c346e9bdb4cd39bcb344abf02bec98 SHA-256: 528fcfb0780c59397704300c5792e7a990a716db06feeb7928120b7afbaef418

378 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1059.007 JavaScript

This PDF file contains multiple critical heuristic firings indicating exploitation of known PDF vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, CVE-2008-2992). These vulnerabilities are used to execute embedded JavaScript. The deobfuscated JavaScript, legacy_pdfkit_stage_000.js, likely downloads and executes a secondary payload, as indicated by the ClamAV detections on extracted artifacts (Js.Exploit.Shellcode-18). The DOC BODY content appears to be obfuscated code or junk data, providing no direct insight into the lure.

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)
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-36307 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36307
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.
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_obj0008_000.js` `ae103b0f0395ca2836097c7937af95f473a9271d7510d64e9b2ad54e2c598e94`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	3066 bytes
Detection ClamAV: Pdf.Exploit.Agent-36307 Obfuscation or payload: unlikely
`legacy_pdfkit_stage_000.js` `fa8410a0a6302620a8e092f9dcae72ecf02417b76ce4e682884984fbe262b87a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xE15	6060 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414`	deobfuscated-js	cross-stage annotation API aliases at offset 0x1E7	81 bytes

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