PDF malware analysis — malicious · 3383f0ffdff7b3f1

MALICIOUS

PDF

8.2 KB

MD5: 072a2f209dd815dec127afb3a2d6e0b3 SHA-1: dac8b20d88cbfb7a1909096eb1bcda148bbe2e54 SHA-256: 3383f0ffdff7b3f1d86aad7137210b1cbf465d89b60bb29cda1bc9d01d71a778

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to execute code. The JavaScript is obfuscated and uses eval() and String.fromCharCode(), indicating an attempt to hide malicious activity. The primary intent appears to be the execution of a second-stage payload, as suggested by the deobfuscated JavaScript artifacts. No specific family could be identified.

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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. (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_obj0004_000.js` `2d97799719ebec698d8d19a96ec8437eba3e725a47366b33e67879bee26a7d34`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	308 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `c59c0c830f7cf16cf9f89fa70e2c8094b9238d71af214e212227942d5e19ef31`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B69	1813 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `9d3a2fc01abd1c7193e147e8f6710a99f60057da280b11dffad04da983b8f4c5`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x35B	5189 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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