PDF malware analysis — malicious · 97babb13214b0c3f

MALICIOUS

PDF

76.5 KB

MD5: 2393290165f7c85e5d6af32436c911de SHA-1: 4da87bba161115fa116dc07799a7522009ab287d SHA-256: 97babb13214b0c3f3608d7eb5cfd76c936eca6c73c70b8524dec5a4c7987e306

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes a binary-XOR stager to decode and execute an Adobe Reader exploit. The critical heuristic 'CVE_2007_5659' specifically identifies the use of 'Collab.collectEmailInfo' to trigger this vulnerability. The recovered JavaScript is XOR-encoded and uses String.fromCharCode, indicating a deliberate attempt to obfuscate the malicious payload. The primary intent appears to be the execution of a second-stage exploit.

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
Binary-XOR JavaScript stager high PDF_BINARY_XOR_JS_STAGER

PDF JavaScript stores viewer-version payload branches as long binary digit strings, XORs each bit pair, converts 8-bit chunks with String.fromCharCode, and evals the recovered exploit stage.
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.
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_obj0004_000.js` `aafd55e3d0a36fb8d91843a6ae93bf550b03f6607f68ad241431c430481568ca`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	78010 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `917ba7577903ac8dae9ca9258383ec500ee979df2b82480b8a9f01796bebe57b`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3D7	1279 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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