PDF malware analysis — malicious · a983a15b53e1df0c

MALICIOUS

PDF

7.9 KB

MD5: af6f63e6d65b621fbf5ef087387ba346 SHA-1: 63a9a7775579bd969ca85edc2ab2fb2e5fe8e130 SHA-256: a983a15b53e1df0c02c1c595b2e13eb87e176f426b1687d2792f6717b4a9528a

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript, including calls to eval() and String.fromCharCode(), indicating obfuscated code execution. The critical CVE-2007-5659 heuristic firing confirms the exploitation of a known PDF vulnerability via the Collab.collectEmailInfo method. The embedded JavaScript streams, particularly legacy_pdfkit_stage_001.js, are likely responsible for downloading and executing a second-stage payload, though the exact nature of the payload could not be determined due to obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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)
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_obj0004_000.js` `50b74ef7209a129dd9c9c490b3f9cf01632aff9ad6c78f02ec298a68fe207624`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	301 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `e74fa483d5532cffe741e58c12d1bb07cbe869b1bb5d6b0d2ff9f63e036e70af`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1A28	1785 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` `f3c8307d12031dccadc644e449e5ac995fa6fdf4bc9ecb236513a3c8b8a9fcfe`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x356	4876 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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