PDF malware analysis — malicious · 9ff00ff696b73e62

MALICIOUS

PDF

8.4 KB

MD5: 0d931e22dd33beca7f3498ae3845888e SHA-1: 106059673790c3ff989d0138a14007c25467a2dd SHA-256: 9ff00ff696b73e625c540f1af5485c1254558edcd4e1d964fad43eee5b344e9a

124 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). The JavaScript is heavily obfuscated using String.fromCharCode and other techniques, but the core functionality appears to be the execution of a malicious payload. The ML classifier strongly indicates maliciousness. The specific exploit and obfuscation methods suggest a downloader or dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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` `872df5c1c30fd6a5ef9daad9b36bd9476228f0d174e0ca73624fa88c70e96513`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	1802 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` `3cf6a22459cda11e607fc9e0dc0c88d01a8425e26488ff87df38d855ceb4dccf`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0xEF	465 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` `8dc89a400e97fa5a51d26040ca5244a03be9e5e48aab6348b8c5bc5b73e94a41`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1C26	1784 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` `e83cf35e36b25e7d91957bbf94173f3f34761a377caa370871e2ce10b4e11cce`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x4B6	5016 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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