PDF malware analysis — malicious · 97c27621c71f6878

MALICIOUS

PDF

9.8 KB

MD5: bd1c464f019922822ee49ac7c52d9462 SHA-1: 83de197159f86f96322de77a7cb03a50137dd442 SHA-256: 97c27621c71f6878aa244f78605898b88979bdae69ad55dd0f7c27d395d03f07

86 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical heuristic firing for CVE-2007-5659 indicates the PDF exploits a vulnerability using embedded JavaScript. The JavaScript is heavily obfuscated, but the `Collab.collectEmailInfo` method is a known indicator for this exploit. The embedded JavaScript streams and deobfuscated files suggest the script's purpose is to download and execute a second-stage payload. The lack of specific IOCs beyond the CVE ID is due to the obfuscation and the nature of the exploit.

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` `d2233358777d1aaed8efae57eefbdc7f0ddc83b20eb36c734bc8ee388da7c061`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	1418 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` `d6a961cc860ec5a8de0be371a9e5faa6ddcb80797f0946d8ef848af03cd5f187`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x440	11972 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `d5ae881d9642da9be20a99278eaf78888414ddc091f6f9f506a56ca347e197ce`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x440	5031 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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