PDF malware analysis — malicious · b9a9a1eb70edf84e

MALICIOUS

PDF

9.5 KB

MD5: f1d10b4d0a745d2ee07ff4aed727f3ea SHA-1: 8b37a3f6ab6b03f6ae3723743e3c57953e493f54 SHA-256: b9a9a1eb70edf84ec0df0c7273b77863761eb5cf850484a6714c9e33a165d7a9

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File: User Execution: Malicious Attachment

The PDF document contains embedded JavaScript that is obfuscated using a hex-encoding method, triggered by the 'Collab.collectEmailInfo' function, which is a known vulnerability (CVE-2007-5659). The analysis indicates that this JavaScript acts as a stager, decoding and executing a further payload. The presence of multiple deobfuscated JavaScript files suggests a complex multi-stage execution process. The primary attack vector is the exploitation of this PDF vulnerability to achieve arbitrary code execution.

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` `9b0ba885c26f0815875dd092d523f411d144043a63082d2d49be393f56858028`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5111 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` `feb330806bfdb7eae671702e08f755fc3ee7f449ab9dcafe0300e513847e6c0c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	12216 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` `2f60dda1d63b4e23557e46cc1a0f05e21fa7d927f5484e46a7b0d652b75b6eb4`	deobfuscated-js	PDF JavaScript deobfuscation pass	72116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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