PDF malware analysis — malicious · ca20f48be1c4e598

MALICIOUS

PDF

43.8 KB

MD5: e0c03ff03c6acc4e8a1fdb1ae231102a SHA-1: 478646d70b7b4e9f856da5a2fe78cb0d4a0d072b SHA-256: ca20f48be1c4e598f5e573dd0d97ecef61ea3da54e5165b2398b3c8830808df4

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains multiple embedded JavaScript streams and exploits CVE-2007-5659 using the `Collab.collectEmailInfo` function to launch a stager. This stager is heavily obfuscated but appears to be designed to download and execute a secondary payload. The presence of U3D content also indicates a potential exploit vector. The extracted JavaScript files are significant artifacts of the attack chain.

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` `2ef86a3b80adf8ad5a17727efd7ed87651e8651ec17a9d259b332654bdcca199`	pdf-javascript-stream	PDF /JS object 9 at offset 0x409F	471 bytes
`annotation_subject_callee_hex_stage_000.js` `b831e20a8662f7108f4b6409cf9661e5a1154babf7c6cda0f3008c65b49373fe`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1A4C	5259 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` `a7f84c6f842e7c183873907093776d99df259c91c3ec7d5c15a1491b1d699352`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1AA0	11865 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` `742b0dfc2e8cbc018eb9bc67175b6d983397f525a113332a03d56a89a00998d0`	deobfuscated-js	PDF JavaScript deobfuscation pass	226766 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off000042e2.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x42E2	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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