PDF malware analysis — malicious · c17f3de4c81879bd

MALICIOUS

PDF

32.9 KB

MD5: 07c1a7f084626f816c4598276bdf39df SHA-1: 79211496523b184815b2b4117cfa16d3287170f5 SHA-256: c17f3de4c81879bd2c93cf06254bdccd099a6d793bb5b86dbec2f563176d7bad

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript and a U3D object, triggering critical heuristics related to CVE-2007-5659 and ClamAV detection (Pdf.Exploit.Agent-35903). The embedded JavaScript, particularly the deobfuscated stages 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', strongly suggests the execution of malicious code. This code is likely responsible for downloading and executing a second-stage payload, a common technique for initial access.

Heuristics 7

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)
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
ClamAV: Pdf.Exploit.Agent-35903 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35903
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `860eae5f96eb426380281c575a089242b50523bbb4bbb8dd765e582cd9c07d2e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A4	294 bytes
`legacy_pdfkit_stage_000.js` `35a593126304d5e68ad73b519748f0fb12f37354af6b540a012bcc74bf4b878a`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2EF	5551 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `6a895dc834f6a5ad5b6810e53c8e66026f68557d8bbc96f03033ad292e7c4e39`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2EF	13048 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off00003333.bin` `b9558f260c19f4bdfa4a1b4fcabe8ba86c09646b00b81aa7a3ef533acae11026`	pdf-3d-stream	PDF U3D 3D stream at offset 0x3333	20243 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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