PDF malware analysis — malicious · f3f159eda25b00ed

MALICIOUS

PDF

8.5 KB

MD5: fb4594ab12f8722ba7ef560ea431faee SHA-1: 20f718d28e51f1813dd7128487f6a75b263590fb SHA-256: f3f159eda25b00ed0181603abf972d5415df69493844f1754c24f799994084c8

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated using string concatenation and character code decoding. The critical heuristic firing indicates exploitation of CVE-2007-5659 via the `Collab.collectEmailInfo` method. The JavaScript is designed to download and execute a second-stage payload. The obfuscated nature of the script and the use of a known exploit suggest a malicious intent, likely to deliver further malware.

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` `bb6c55bfa73ab195c6f3d3149c327866218ccf99c7295ce47eb0620ff8d7e081`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1CAF	1810 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` `52d0361925d8238b7f654c2d2adb7315201c371bdf5cda15ceeef05bd264f03c`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x4D0	5068 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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