PDF malware analysis — malicious · b1a2cad81603c9fe

MALICIOUS

PDF

1.95 MB

MD5: 6f74c3fd877a671b59e5988232b8c26b SHA-1: 6411717af8f03bb0e23665b7d3ab69caf8a2c7cc SHA-256: b1a2cad81603c9fe28fc29eee5b7ce4762944363e7ffe4c270bf24da14b2ef53

78 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 via the Collab.collectEmailInfo function. This JavaScript is heavily obfuscated but appears designed to download and execute a second-stage payload. The presence of multiple JavaScript streams and the critical heuristic firing strongly indicate a malicious intent to exploit this PDF vulnerability.

Heuristics 4

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.
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_obj0001_000.js` `82ce2411397fd84254b42dee048772506cef95067d58ecd75ae5a451bdb0a69f`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	41 bytes
`javascript_obj0013_001.js` `58e2a4674cc2cd212b38ec99a992a075b74143257cdef778bd6134fe82036d0c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x369	18064 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `ba759ff9a0fdb798eeb0d8a4c26d59656dc6fab084bcec95ac5b97da057eef30`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x369	2043 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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