PDF malware analysis — malicious · e24dc71e800208d7

MALICIOUS

PDF

9.4 KB

MD5: ed1a18b5e308f3238b1814d69c7f86e7 SHA-1: 2c2eb17a94c500310320b1b1009afc6991bb0746 SHA-256: e24dc71e800208d758b284f6bfb0690989c8f735fcef140a6dcf697d228aa897

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

The PDF file contains embedded JavaScript that is obfuscated and uses a hex decoder. The critical heuristic CVE_2007_5659 indicates the use of the Collab.collectEmailInfo method to launch this JavaScript. This script likely functions as a stager, downloading and executing a secondary payload. The presence of obfuscated JavaScript and the exploitation of a known PDF vulnerability point to a malicious document designed for payload delivery.

Heuristics 6

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)
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_obj0007_000.js` `b9a85ee399db318b3ad68d0755effe289a645a7404fad2094712c8a3fd042920`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	244 bytes
`annotation_subject_callee_hex_stage_000.js` `1731acd9442b69033a952284a3ae869948de8d85922b22ceeb822636c6926b4b`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5036 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` `73db7bb741a8ea0fe3f2465c1d4557e7ca6375ef9f7772f32557c693be19802c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	12172 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` `2145e7a8f7d29613ae8ca6cd499c9756c8a6a1e5517b8e121428c989dee855d9`	deobfuscated-js	PDF JavaScript deobfuscation pass	45053 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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