PDF malware analysis — malicious · 313a64a21ae0242a

MALICIOUS

PDF

12.3 KB

MD5: f8849787cf8bf1d03e4816f62cb3f1b6 SHA-1: 9f309beefc7d06a73c9e6559cbbb47b461201cb6 SHA-256: 313a64a21ae0242acd8109d6c2e0c6a9e4635bba732f517a2ca8e956c30670e7

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/URL T1071.001 Web Protocols

The PDF file contains embedded JavaScript that is triggered by the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). This JavaScript is further obfuscated and extracted into two files, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js. These scripts are responsible for downloading and executing a second-stage payload, indicating a downloader or droppper attack pattern. The exact nature of the second-stage payload could not be determined due to the obfuscation, but the overall intent is clear.

Heuristics 4

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.
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_obj0007_000.js` `1847af0a099665b6ac45af66402e56ed64237a1b287618ee3d6643267fda6f35`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	343 bytes
`legacy_pdfkit_stage_000.js` `26d3d20086c4a9350f75b63bb253a1f50ed34cb8fc4801dfb72cb10b5b06e122`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	11977 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `04cd1d0f2ea444d9351e1df7f93a7f46c6e7e04dcc3a352399a15f6007397fb4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	4925 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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