PDF malware analysis — malicious · 78bbf093ea46c2c9

MALICIOUS

PDF

29.9 KB

MD5: 55434c966f85e8436502326920faa9ae SHA-1: 3a87250654f0a2deca662bd60ebc7d6a659ba8b4 SHA-256: 78bbf093ea46c2c9a11b64a8a74f3904d1edb1e00919172640b7b7fe0045d808

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The critical ClamAV detection and the presence of PDF JavaScript and U3D content strongly indicate a malicious PDF exploiting a known vulnerability. The embedded JavaScript, identified as 'legacy_pdfkit_stage_000.js', is likely responsible for downloading and executing a second-stage payload. The U3D content, flagged as CVE-related, further supports the exploit vector.

Heuristics 6

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 3

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` `ec9da3b338d8905110cd356f08186243c91090b0175ae27168255fa65f54a4f1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2EF	8904 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_off00002ce6.bin` `c8174b1fa307b8244afaa23a5ae14e903261b3493f7cf8c773a0de2042559218`	pdf-3d-stream	PDF U3D 3D stream at offset 0x2CE6	18803 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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