PDF malware analysis — malicious · 04e9befc0c4c82fa

MALICIOUS

PDF

9.6 KB

MD5: 0599d16c1e46be7ec56c73c7cde522ee SHA-1: db38b688085553f706d8136bc1a2396d9808d0bd SHA-256: 04e9befc0c4c82fad088e7df1a66faac490efee929bc1350e736f485c6a16b94

278 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains JavaScript that exploits CVE-2007-5659, specifically targeting Adobe Reader versions between 7.1 and 8.11. The script uses the syncAnnotScan primitive to retrieve an encoded payload from an annotation subject, decodes it, and then evaluates it. This decoded payload contains a URL, http://xgzkuqgudcb.com/nte/avorp1tuta8.html/eU230d9c2eH55d1bc42V0100f060006R4544cb6f102Td44f13d4203l000cK89a1696d, which is likely used to download and execute a second-stage malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

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.
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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.
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.
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://xgzkuqgudcb.com/nte/avorp1tuta8.html/eU230d9c2eH55d1bc42V0100f060006R4544cb6f102Td44f13d4203l000cK89a1696d

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `dc37160715dd481d0bf49e7af5079aad16ed0e66896c1ae05ca27000b3e4454e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	259 bytes
`generic_stage_recovery_000.js` `1f9c41bac023af5173acb947acb1765aece4fb2d478d8f77dfc696cb5d6327ed`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 7 at offset 0x19B	249 bytes
`annotation_subject_callee_hex_stage_000.js` `a4114d2547ab0173285a4a8944fbe34d9bbb65722ca2af17fb420d7dec4fc63d`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5177 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `987d2d02639bc9fbe644eca94048749caa7c332603517a8e1fd1e21807dd8a9c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D4	12321 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `5d6653063147890ea6c2ce8f4396f5dcec4890905501cb7363e6ed7ded173554`	deobfuscated-js	PDF JavaScript deobfuscation pass	44112 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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