PDF malware analysis — malicious · 9372fa306bc7d858

MALICIOUS

PDF

44.6 KB

MD5: 81401657041d56a9530e12d2d2d8c457 SHA-1: 122795d3f47c03005fb799fbe860a4c8e38087bc SHA-256: 9372fa306bc7d858bfa4c01e9f0defad29de2a8d85b4dc53da5deec3e4ec54a4

106 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1059.001 Command and Scripting Interpreter: JavaScript T1559.001 Component Object Model Hijacking: Component Enablement

The PDF file contains embedded JavaScript and U3D content, with heuristics indicating a CVE-related exploit targeting Adobe Reader's 3D parsing capabilities. The presence of multiple JavaScript files, including a large 'deobfuscated.js', suggests the script is designed to download and execute a second-stage payload. The unescape() call and syncAnnotScan primitive further support the exploitation of PDF vulnerabilities.

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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `3185725d1d6720a44a86ea6b71cc2cc403b0506593fae676bafde71d6ece01a0`	pdf-javascript-stream	PDF /JS object 9 at offset 0x43E1	472 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` `d52d0cd2e553ed3e5e54ecc268721b6f469a175facdc98b3b53ae439689043d9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B5A	12129 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).
`deobfuscated.js` `9da06422604b4c64d04f90d43bbd347b07981b336c426be86e634b83eec4b6c5`	deobfuscated-js	PDF JavaScript deobfuscation pass	229795 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off00004617.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4617	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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