PDF malware analysis — malicious · e5e0e53f8f8b7362

MALICIOUS

PDF

13.2 KB

MD5: b8176740eb19e59bc5da3fc439c35088 SHA-1: 365c0f95ac561b95bbf5b78932ba11259cda46b7 SHA-256: e5e0e53f8f8b73627e3d2c5f779f9ae257d333d989d5b0099632a9ecb8a4b83b

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript that is XOR-encoded and uses String.fromCharCode, indicative of a stager. The critical heuristic CVE_2007_5659 specifically identifies the use of Collab.collectEmailInfo, a known vulnerability in Adobe Reader. This exploit stage is designed to download and execute a second-stage payload. The file's structure and the nature of the heuristics strongly suggest it's a dropper for further malicious activity.

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)
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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. (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_obj0049_000.js` `4527c383a288e66260eaf66616abc1c247c921e8967cf74a8536ca5bec5e838b`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	78268 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `96199e11f205b356fa22ea80f51f480f1ef5cef88e2b701d7540aa7ce148f08a`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1306 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.