PDF / .THI malware analysis — malicious · a147c377a6720c02

MALICIOUS

PDF / .THI

44.5 KB

MD5: 5338733c37371d059afb3c35b7864074 SHA-1: d97f36a10848285fecae2bf0ce9d2d3e84555670 SHA-256: a147c377a6720c0257e554afbb456fb9b9963f55b4ccd1e97326861899c8a091

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript and U3D content, indicating an attempt to exploit vulnerabilities. Specifically, the 'CVE_2007_5659' heuristic firing points to the use of 'Collab.collectEmailInfo' to execute a hex-decoded JavaScript stager. This stager is responsible for downloading and executing a second-stage payload, which is a common technique for initial access and further system compromise.

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.
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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` `e8adacab8483e440376bc05096fdd738e8114d6be4de03c87d9d1cf7ec997c99`	pdf-javascript-stream	PDF /JS object 9 at offset 0x4371	474 bytes
`annotation_subject_callee_hex_stage_000.js` `6f0afbf4894da9d51fa20e5b96cde81d6742f85cd84aa89b4896405e2896add8`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1B49	5460 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `cfba28fd822c31edcef1ba2a0804d2a3fb8e0db48782e0192114bbddf3257771`	deobfuscated-js	PDF JavaScript deobfuscation pass	222661 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off000045ba.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x45BA	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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