PDF malware analysis — malicious · c66070f4688ea013

MALICIOUS

PDF

36.7 KB

MD5: f9007afa739e66e76cb717a41dbd4e4f SHA-1: d698cc261823cbeea6d9a48db9d7202f4a2cfb58 SHA-256: c66070f4688ea0134920a226250f0b688d35a05cec022b9a43ca4018aed88ede

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains multiple indicators of malicious JavaScript execution, including PDF_JAVASCRIPT, PDF_JS, and PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER heuristics. The critical CVE_2007_5659 firing specifically points to the use of Collab.collectEmailInfo for JavaScript stager execution. The embedded JavaScript, particularly 'deobfuscated.js', is extensive and likely responsible for downloading and executing a secondary payload, although the exact URL or mechanism is not directly recoverable from the provided evidence. The presence of U3D content also suggests an attempt to leverage known PDF vulnerabilities.

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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `b9a85ee399db318b3ad68d0755effe289a645a7404fad2094712c8a3fd042920`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A2	244 bytes
`annotation_subject_callee_hex_stage_000.js` `7a9a6c1bfc099ab176b134d94979d5f3bf531f105bfebc70fa1364de51101325`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x151	5279 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `50c62c798f5a198d24420a154665d1020af8fe7cf13201ecfe44637792a3ee31`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D1	12490 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).
`deobfuscated.js` `dc0ccca34dbd034cdfcdf6e7eebd1d1f99348995f703c06cfb9c3e7fc103ecbb`	deobfuscated-js	PDF JavaScript deobfuscation pass	199861 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off000026d1.bin` `70cf2aead4823e6d2651c9281eed0aa967449da358f439efb9e8e707421175e0`	pdf-3d-stream	PDF U3D 3D stream at offset 0x26D1	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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