PDF malware analysis — malicious · 2cc66c6e4af93637

MALICIOUS

PDF

9.3 KB

MD5: 505213df1c5e7d5e3bf0451fe0e87b5a SHA-1: 4d06d16dd6a64c51dcaf79ddf6664045db913c5e SHA-256: 2cc66c6e4af93637fabc4e906c1fae93bd9b062ed51a1a6971d7c952d990f8f6

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains obfuscated JavaScript, detected by multiple heuristics including critical firings for CVE_2007_5659 and ClamAV. The primary mechanism involves exploiting a vulnerability (CVE-2007-5659) via the `Collab.collectEmailInfo` method to execute a JavaScript stager. This stager decodes a larger payload, as evidenced by the extracted `annotation_subject_callee_hex_stage_000.js` and `deobfuscated.js` files. The exact intent of the final payload is not fully discernible from the provided evidence, but the exploit chain is clear.

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)
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `11b03694c4e705ab29873cc5e2c55342ee498b376ac2dc5f05ce17018ef44c38`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	264 bytes
`annotation_subject_callee_hex_stage_000.js` `1a1eca53327adbf7b169b359cab5eaa436cb9efe8a6cfd141ad03373a86724f7`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5035 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `fd892b03e12c9096f652d85114dac9358240ae15ebe2f6c587ec3afe2947e99e`	deobfuscated-js	PDF JavaScript deobfuscation pass	69951 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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