PDF malware analysis — malicious · 35a3ebbf89caaeda

MALICIOUS

PDF

45.0 KB

MD5: dbbf799d0e37b702e437135ae4eb227c SHA-1: ea4d4be5cdb2ae5786662ddf17d8c1764efbcfd1 SHA-256: 35a3ebbf89caaedac4290fd047466db02e2cbd720e7df13220e903b2e674a8f9

166 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious PDF T1059.001 Command and Scripting Interpreter: JavaScript

The PDF file contains embedded JavaScript, specifically triggered by the CVE-2007-5659 vulnerability related to 'collab.collectEmailInfo'. This vulnerability allows for the execution of a JavaScript stager, which is heavily obfuscated but ultimately decodes and executes further stages. The presence of U3D content and the specific CVE firing strongly indicate a malicious PDF designed to exploit a known vulnerability for code execution.

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_obj0009_000.js` `e8adacab8483e440376bc05096fdd738e8114d6be4de03c87d9d1cf7ec997c99`	pdf-javascript-stream	PDF /JS object 9 at offset 0x456F	474 bytes
`annotation_subject_callee_hex_stage_000.js` `3729db5d324a4cb36c8ee6d8e41a3528d5a9514f0690c2033a535fb398d39e75`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1C40	5696 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `743343018a946c33ab2c832f300726c30967b193be40e2d8a3bddc75e26c04c8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1C94	12764 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` `9c38d48c49e3e465ba432e40d8cc1ae56e534fcc0d4c51c08510914845b274fe`	deobfuscated-js	PDF JavaScript deobfuscation pass	221759 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off000047b8.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x47B8	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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