PDF malware analysis — malicious · 00368fc392b76d28

MALICIOUS

PDF

11.6 KB

MD5: 4e096eaef1efd3ec50c23cc323771f99 SHA-1: b4202cb357af5d685fb827813af898daa24b4a6e SHA-256: 00368fc392b76d280c1fdaeadb170d343a2701ebb0ad94256fd6294980d8c154

290 Risk Score

Malware Insights

MITRE ATT&CK

T1105 Ingress Tool Transfer

This PDF exploits CVE-2007-5659 using embedded JavaScript to download a second-stage payload. The JavaScript decodes a hex-encoded stager and uses it to fetch a PE file from the URL http://vbcbtpuvbvf.com/nte/prox.exe/yH622c3aefV0100f060006R0fa507f5102T604dd0d7203l000c, which is then likely executed. The exploit targets specific versions of Adobe Reader, as indicated by the APSB08-13 patch gate heuristic.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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)
Adobe Reader APSB08-13 patch-range version gate (CVE-2007-5659) high CVE likely PDF_JS_ADOBE_APSB08_13_PATCH_GATE

PDF JavaScript gates the exploit payload on (>= 8 && < 8.1.1) OR (< 7.1) — the Reader 7.0.x / 8.0–8.1.1 window patched by Adobe APSB08-13 for the CVE-2007-5659 Collab.collectEmailInfo buffer overflow. Only kits that target that exact bug check both of those patch points; benign scripts do not.
ClamAV: Pdf.Exploit.Agent-36181 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36181
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.
PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL

Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
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.
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://vbcbtpuvbvf.com/nte/prox.exe/yH622c3aefV0100f060006R0fa507f5102T604dd0d7203l000c

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `a246c68d5544a5fc390ae92571a910dee0516c54ba546b2460fd1ca6ec360799`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	604 bytes
`annotation_subject_callee_hex_stage_000.js` `32cfe530a8019d1ad21fbe119310ad6938ec4e0e2d94d74ed2bc89ea4f02ae73`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5143 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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