PDF malware analysis — malicious · 49953036ec5431c7

MALICIOUS

PDF

75.7 KB

MD5: bc7bd951017294901288bdd600724002 SHA-1: e978f523dd17729ec2691e8a2fe85084d8d5336e SHA-256: 49953036ec5431c76845a33f42566f37986114445fe910007b7aa1c7b1251b80

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 a second-stage payload. The critical heuristic firing for CVE-2007-5659 indicates the exploitation of a known Adobe Reader vulnerability via the Collab.collectEmailInfo method. The script's obfuscation and use of eval() suggest it is designed to download and run further malicious code.

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` `a15e24db229eef0c30258729686ada92fee902a481ca56db132ec1f4e08b9135`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	77146 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` `4417b8d9ddcd3f474e319b5218b174d92cd8bab428b663ae80fd2a98269a5837`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3D7	1261 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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