PDF malware analysis — malicious · 81e6ea2069457d1f

MALICIOUS

PDF

44.3 KB

MD5: 853c6e6d664fa314edd7335e97ffa031 SHA-1: 86dd5bea757f3c0af77587c86b7f2e2819c0ccb5 SHA-256: 81e6ea2069457d1f6fbcd42b5e19d3afb66271e5e7d40ded58bb43b0a67acd2a

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, triggered by a vulnerability related to CVE-2007-5659 and the `collab.collectEmailInfo` function. This JavaScript is heavily obfuscated but appears to be a stager designed to download and execute a second-stage payload. The presence of U3D content and the use of annotation staging primitives further indicate a malicious intent to exploit 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `f6cfd7e0d7b6d48fa98774e01bd7c172232669e5a6080722adf7a5753a6eec07`	pdf-javascript-stream	PDF /JS object 9 at offset 0x42D4	441 bytes
`annotation_subject_callee_hex_stage_000.js` `b4b0c400f007e6391c589ac507233a13a337deb878f83231c4135c8468585329`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1B0C	5490 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `1df6c8aa1138d4db9c9316c79eb5450baf6dd7c8b21a7727debf9766cebfd311`	deobfuscated-js	PDF JavaScript deobfuscation pass	231890 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off0000450b.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x450B	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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