PDF malware analysis — malicious · ff624b6c4f0a1bf8

MALICIOUS

PDF

47.9 KB

MD5: 25e958f689a8e8d0002ded993eff0679 SHA-1: 80602361a5c9dbd5da971d84ceba6955ee4646e5 SHA-256: ff624b6c4f0a1bf8b62cea2051ec6aa2503c9aa66dd56d63d82d6165e7b1a725

106 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript and leverages a U3D content vulnerability, indicating an exploit attempt. The heuristic firings suggest the use of JavaScript for malicious actions, potentially involving the execution of a second-stage payload. The presence of multiple JavaScript files and a U3D binary further supports this. The exact intent of the script is not fully discernible due to potential obfuscation, but it is highly likely to be part of a multi-stage attack.

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` `f2e2bab5d470ea547a4eab617518549c8cc68e8c7c23105880f8be1a12629b26`	pdf-javascript-stream	PDF /JS object 9 at offset 0x5130	458 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` `fae4557f2a45dde584b201c676f941c2cae2d6f82eba090585452e61052fdd87`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x20F1	14608 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_off0000536b.bin` `a96e1fca2499edf504d3934052ca1fc338d4b4898a65e6a361937ed1ba0dc0fe`	pdf-3d-stream	PDF U3D 3D stream at offset 0x536B	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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