PDF malware analysis — malicious · a5ae3c418a0a5adb

MALICIOUS

PDF

45.2 KB

MD5: d587afa0f84775937d6e5635236307f2 SHA-1: 398c6d52b67cfcebee8bd27b322c0f612b17a57f SHA-256: a5ae3c418a0a5adb70a7123be1d0b80f86e5199f175de67c6b543967eb772b9b

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF file contains embedded JavaScript and exploits a known vulnerability related to the Adobe Reader 3D parser (CVE-family indicator). The JavaScript stream, particularly the deobfuscated version 'legacy_pdfkit_stage_000.js', is highly suspicious and likely responsible for downloading and executing a second-stage payload. The presence of U3D content further supports the exploitation 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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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_obj0009_000.js` `72c2309202ad0d29d8842970b17facdf3cc0c8295e8666b0ffe1635ba44f3741`	pdf-javascript-stream	PDF /JS object 9 at offset 0x4670	457 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `0bf9f921b7fc0e8e78c15f057cc480d0c158cc7ab0ed183b02fd086c4d6e397e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1C8A	12657 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off000048ab.bin` `a96e1fca2499edf504d3934052ca1fc338d4b4898a65e6a361937ed1ba0dc0fe`	pdf-3d-stream	PDF U3D 3D stream at offset 0x48AB	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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