PDF malware analysis — malicious · 299a4265e922d10f

MALICIOUS

PDF

9.4 KB

MD5: ef55a0ba7b57e4bbed19272987a0b80a SHA-1: d4f0729adde99db69fbc7678a15181a7e16bff7c SHA-256: 299a4265e922d10f53ec0333a7a2e52229dc211b1cc3a90c0a1e59a76675c5ab

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains embedded JavaScript that is obfuscated and utilizes the unescape() function, indicative of exploit code. Specifically, the CVE-2007-5659 heuristic fired, pointing to the use of Collab.collectEmailInfo for exploitation. The presence of multiple deobfuscated JavaScript files suggests a multi-stage loading process. The primary intent appears to be the execution of arbitrary code via the PDF vulnerability, likely leading to the download and execution of further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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. (identified after JavaScript deobfuscation)
ClamAV: Pdf.Exploit.Agent-35905 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35905
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.
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_obj0007_000.js` `d8a6b4ad1abf04d0c4a4f89535cfb57f7312edef25c443f4e844c8ec9d0929dd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	352 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` `3dbbdbbdb94d462af75ee66e398cd0a83e850f1f05062b57bd9318490a27c67c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12100 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` `f458269915c042178d8f4fb78dc485c1b0ccb9c7d1955e6e42a4311d75f109a3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5045 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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