PDF malware analysis — malicious · a8529c039622af68

MALICIOUS

PDF

35.2 KB

MD5: a53e78e656acb463842a3ddd97fdc22f SHA-1: 3d6fd1d77c2effe5af8e621856a98c26bcd53b84 SHA-256: a8529c039622af680b6a3c99dd04b8617388c5d7f39e5d832384836c5d705bdd

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, which is triggered by the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). The JavaScript is obfuscated using String.fromCharCode and unescape(), indicating an attempt to hide malicious functionality. The primary goal appears to be the execution of this JavaScript, likely to download and execute a second-stage payload.

Heuristics 6

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. (matched in decompressed stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `cf80cbfaed807a4188abf491638ed7ed7b0a58658a92cefe77c80f9cd1afd448`	pdf-javascript-stream	PDF /JS object 1 at offset 0x10	5514 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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