PDF malware analysis — malicious · 4b4aa9116e7290d8

MALICIOUS

PDF

8.2 KB

MD5: 8000b076467717e09a3b8ddedcdaeeab SHA-1: a6497c3b359c410af17824d7cebf0ac927c46804 SHA-256: 4b4aa9116e7290d82bd9306f685388aa546a3e10b47a567900e8c2ac435ce437

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability. The JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The use of syncAnnotScan and collab.collectEmailInfo are indicators of this exploit technique. Due to the obfuscation, the exact nature of the payload cannot be determined, hence the 'unknown family' classification.

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)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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. (identified after JavaScript deobfuscation)
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_obj0004_000.js` `8b70e431ed36d84945464549cd8184fb5a7cf6ee13d19263f40a1485872c8893`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	2105 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `9d5c7e01faed5b04e9ec11f1d98b73f0012c871beaf60e9f9d32ad6df00d46f7`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0xEF	550 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `fd38743d46014544b70ec24c10b2ac6c0fbb7f892b99b289e340da98dbd1c849`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B2E	1790 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `a3e2d39c365444546b0ca37616fd49fc67717df4a000f2c8ece018ec072be26c`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x4D0	4821 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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