PDF malware analysis — malicious · 1a4e562ca5546d28

MALICIOUS

PDF

8.1 KB

MD5: c01ccaaf31671aab904be38a5fe4f664 SHA-1: fd2335e18044f562c26db2891c64405ed0bc286f SHA-256: 1a4e562ca5546d2839666d5595e77542d562714b3759ff06ca2af0cfd2d7f819

156 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file exploits the CVE-2007-5659 vulnerability to execute embedded JavaScript. The JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload from a remote location. The ML classifier strongly indicates maliciousness, and the presence of JavaScript actions and eval() calls further supports this assessment.

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` `0571af552b71bac571eb84e90631aa8798888aa52cab05960d0c6759a7686e5d`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	312 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` `ad44b13bb4caf3b6ad90d9bd232c3e19278a50cfc4eab2e365e28af93e4417e4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B08	1821 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` `816d79e6691942675f6ddd0107fb64ce93bf001b8f7fbe9264836e9cff12197e`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x35D	5124 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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