PDF malware analysis — malicious · 49cfa6cfe9293d31

MALICIOUS

PDF

46.2 KB

MD5: c5f46e9e62fe0838b16a2eb762cf70e5 SHA-1: 78feb345265fe8e23e3ae87cea5437aa158eec14 SHA-256: 49cfa6cfe9293d3151a4a3127efee3943c8349b20e17b69175c6a0b56698e65f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability related to 'collab.collectEmailInfo'. This JavaScript is heavily obfuscated and appears to be a stager designed to download and execute a second-stage payload. The presence of multiple deobfuscated JavaScript files and a U3D stream further indicates a complex exploit chain. The primary attack vector is the exploitation of a known Adobe Reader vulnerability.

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` `80aa1852ef424c98f9177d800e7f87867115283875d22e6b2523e6faea9b918e`	pdf-javascript-stream	PDF /JS object 9 at offset 0x4A1E	471 bytes
`annotation_subject_callee_hex_stage_000.js` `104d49c436fa246d490aac37e84021ce31b869755ab09250b584ff46eda1caba`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1E0D	6133 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` `4982213a84db0f84f0c19702b757abfda45aed8ba7c286412468292d3769c7ea`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1E61	13569 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` `0f64720c7ba3c766e91ca960b15f98fdf3ef6bc36440d065efed825135d48d1c`	deobfuscated-js	PDF JavaScript deobfuscation pass	232559 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off00004c63.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4C63	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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