PDF malware analysis — malicious · 55a9d36bc6fdd38d

MALICIOUS

PDF

9.3 KB

MD5: f2485975c73fc76905902123f0a27af3 SHA-1: e2178237877f8c333213a619b843bf118764aa1d SHA-256: 55a9d36bc6fdd38d8a10c61b25ec8f448e3be395fc283a79ccc68a39dbfd41f9

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript that is obfuscated and uses a hex decoder. This script is designed to exploit CVE-2007-5659, specifically leveraging the 'Collab.collectEmailInfo' function to stage and execute a malicious payload. The high-confidence heuristic firings confirm the use of this exploit and the JavaScript stager mechanism. The document body was unreadable, but the exploit and script behavior indicate a malicious intent to execute arbitrary code.

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` `af621fdcff6569b3bee36bfe8b579d0ebb22a489f871dc5eb30f752974305049`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4970 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` `a353d15ea10aa059484f322c3aba68598805cce712a6ccb034126bb2ae58c2dd`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	11820 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` `b0ded6bf989b9bfa7763895aaacfe897af88ba84b7f8e8e9946dc3ba9ab6e198`	deobfuscated-js	PDF JavaScript deobfuscation pass	43705 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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