PDF malware analysis — malicious · 3cf7935803b76af7

MALICIOUS

PDF

45.1 KB

MD5: 87ac831956754cd44f986c7102710d2e SHA-1: c32108bf58d10449b0f24abd19da12c0d308e12c SHA-256: 3cf7935803b76af74731ff00ec63df7f22542d49ea7b293ce27bbdc74dcfc822

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and then decoded. This script is designed to exploit the CVE-2007-5659 vulnerability in Adobe Reader, specifically using the `collab.collectEmailInfo` function. The primary goal appears to be downloading and executing a second-stage payload, as indicated by the high-entropy and obfuscated nature of the extracted JavaScript streams. The presence of U3D content also suggests an attempt to leverage 3D parsing 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 0x45C2	441 bytes
`annotation_subject_callee_hex_stage_000.js` `d968a4bce2bc51f50e3257565750e44bd670f249efc0cde0ca01cf5315b7b1b2`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1C38	5759 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `75751e53a4e3234d029ede0ca772dcd71fd62d32bd18f200d502d25132af5fa7`	deobfuscated-js	PDF JavaScript deobfuscation pass	227801 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off000047f9.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x47F9	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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