PDF malware analysis — malicious · facee3abe9c7e4eb

MALICIOUS

PDF

8.0 KB

MD5: 36f8bcccf2d85dce7887c2610a8a2f1e SHA-1: 872fb6019c05975a1f567977bf8f1714f177faf5 SHA-256: facee3abe9c7e4eb75f7eb165859a9b870f1505ebc1cfb2e4497dd718e01b67d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. A critical finding is the CVE-2007-5659 exploit, which leverages the Collab.collectEmailInfo function to execute decoded JavaScript. The presence of eval() calls and String.fromCharCode further indicates obfuscated script execution. The ML classifier strongly flags this PDF as malicious. The primary attack vector appears to be the exploitation of a known PDF vulnerability to run arbitrary code.

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` `47ed06e27e524282993f18b16401e26993b9069ab694dc247a1d16c2e0644faf`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	300 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` `522bb58f8e0709d6de77ee32690d83b5a3357aada2bf7e1817a7a9c3d2a57e76`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1ABE	1769 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` `aff1ad2842cac3a690b2464f3f07ba06faa4c94e8f24a5dfc5569b4a55c80d66`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x352	4997 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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