PDF malware analysis — malicious · fc9384b6bfe0b4ae

MALICIOUS

PDF

2.4 KB

MD5: 1ed321159842bc43691a45c70fc8dde2 SHA-1: a3dfcc46f156d84a1f60a2bf28050b732fb66f30 SHA-256: fc9384b6bfe0b4ae3ab9bceee9e43e4f6a158130500d96f69f1535c1203599cd

166 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The PDF document contains embedded JavaScript that utilizes the `Collab.collectEmailInfo` method, a known indicator for the CVE-2007-5659 vulnerability. The JavaScript is obfuscated using `eval()` and `unescape()`, and further processed by `String.fromCharCode()`, suggesting an attempt to hide malicious code. The primary intent appears to be the execution of this script, which likely leads to the download and execution of a secondary payload, as indicated by the presence of deobfuscated JavaScript files.

Heuristics 7

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)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `e7d1232c16a6e584ebcad6ed89ed39659361935894de0b1df6aee2e4fe16ce04`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x84B	478 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `9521fb99c0e23535a27ed01dd6e6188a78e3a2553dd3b1a084aaa051132f1556`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2634 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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