PDF malware analysis — malicious · 2722d60231e483a2

MALICIOUS

PDF

MD5: 3a67bd03d3e21257a8f52aca03186d49 SHA-1: 3b715eb508fc2e969b39d6992ba89c6eaba9dc69 SHA-256: 2722d60231e483a20b22b68164dbb22ef5a2daec96d3d365f01b41f24651712a

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF document contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability using the Collab.collectEmailInfo function. This JavaScript is obfuscated and likely serves to download and execute a second-stage payload. The presence of multiple JavaScript streams and the critical heuristic firing for CVE-2007-5659 strongly indicate malicious intent.

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` `27d4c8ca1b600a6cf05aca05f6e8167fed01f72db37318e62a681120bc7f5167`	pdf-javascript-stream	PDF /JS object 4 at offset 0x2B7	2182 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` `ab3f4be7a3e2e879e844dcace56ca59cf8fe7249dc5a05c90896f0c9e7dd732a`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x2C7	559 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` `bafbe028f570f827b8889df90610c86efda3ac2b7154b34f0cb5caa79ff10457`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1D66	1938 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` `ea9c577fcb9d70a2dcfc6791f36792967d27abb1a4464b3baa547e949f9aa512`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x5B8	5092 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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