PDF malware analysis — malicious · a2676760329c9185

MALICIOUS

PDF

9.8 KB

MD5: 64aa3ab88d340e6e7d8e60896c30f56d SHA-1: 36b14f40c7e7420088d1ab86d10577ef04e463eb SHA-256: a2676760329c9185a89daa0b368db00cde293b4dcd1bd059273676fdcb5c19a9

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). This JavaScript is heavily obfuscated and appears to be designed to download and execute a second-stage payload. The presence of multiple deobfuscated JavaScript files further indicates a complex, multi-stage attack. The exact nature of the payload cannot be determined due to obfuscation, but the exploit mechanism is clear.

Heuristics 5

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)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `d2233358777d1aaed8efae57eefbdc7f0ddc83b20eb36c734bc8ee388da7c061`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	1418 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `fb897ef5ada984f9597557784b24e5231f52e997a6f4844c2ee36336d8a2f03b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x440	12152 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `eec470afe8cc12469a1db68a154774dc05b7674d31e167b255afbc3c5808f9b9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x440	5037 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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