PDF malware analysis — malicious · e71847df291be14c

MALICIOUS

PDF

12.4 KB

MD5: 23cf7d23d0c721c10efc5025fa1048f7 SHA-1: a1a4d256fb850152dd692042fc94c99f066bc82c SHA-256: e71847df291be14c5a5d3eab618c0cb9b5ef8d346cc1341d3c46aa4eb089ee28

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, specifically triggering the CVE-2007-5659 vulnerability via the `collab.collectEmailInfo()` function. This JavaScript is heavily obfuscated but appears designed to download and execute a second-stage payload. The presence of multiple JavaScript streams and the critical heuristic firing strongly indicate an exploit attempt.

Heuristics 5

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)
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_obj0005_000.js` `867657a7a74659a94c0b84716da0b7b245a9f7e0da657e729442653a96a79d92`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	1225 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` `e1b5ca2e00313f019048c794825e20530d7f97336509cafc5021e59a0012ba62`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x424	5051 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `7d5e8f24ea6414909a52610305d232a901aef27cb61fcae6b4af613bc507456a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x424	12181 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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