PDF malware analysis — malicious · 8817533754a5ecec

MALICIOUS

PDF

74.7 KB

MD5: e1af20a702a8571c283dd316f8ae8518 SHA-1: c1f096fb4f3e3af4639873c2e782159dc2f45c01 SHA-256: 8817533754a5ecec08bddaed87f37792e11516fb497f1f142a4e00dbb39d1a83

168 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF document contains obfuscated JavaScript, identified as a binary-XOR stager, which exploits CVE-2007-5659. This stager decodes and executes further JavaScript, likely to download and run a second-stage payload. The `Collab.collectEmailInfo` method is a known indicator for this specific vulnerability.

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` `3e3f440d9606b1705c13efed678f270b9f990464ed4d70bb489b63e82ee0b680`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	76181 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` `0d891a651370ca5b4f48a97d6ef2de6e0224aa6b9569968b2141a55f9a0b862c`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x65AE	1237 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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