PDF malware analysis — malicious · d4257bc13fdc9959

MALICIOUS

PDF

13.2 KB

MD5: e388a4ee5cbe9b79db336a529bcaab44 SHA-1: 6e2d95bfb644e135b23b07db883e6095d62bc720 SHA-256: d4257bc13fdc9959b425b5b281d32a59008e1d37e718be9fc941a30c86d2b193

188 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is obfuscated using binary-XOR encoding. This script is designed to exploit CVE-2007-5659 (Collab.collectEmailInfo) in Adobe Reader, leading to the execution of a second-stage payload. The ClamAV detection further confirms its malicious nature as a dropper.

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: Pdf.Dropper.Agent-7308337-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7308337-0
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` `4f37abf35e5a92472cd2c28e12d88254bd65e2d8ff2b95c9c89677090260d84a`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	78376 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` `bfd8118e87d27afe3ddcce1215ba72da37ba8c790009a4fd15cf69dc721340ed`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x464	1306 bytes

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